Are linear tracking arms better than pivoted arms?

Atmasphere wrote a very good - and true - comment. That's the way it is.
When you compare those Arms on a table which can hold several Arms and you use a demanding music with a lot of dynamic swings - like the old Deccas, no reissues - you will discover very fast what linear tracking Arms CAN'T do, they are not able to reproduce a Physical Force which is in the recording (has nothing to do with volume).
The silence in the grooves based on that kind of tracking is true, but this is only 1 parameter.
Anyway, it is not necessary to split hairs, today we have pivot Designs which are not outstanding and a linear tracker beat them. The difference is pretty simple, you design a working pivot, the Designer has to think and has to solve some problems, otherwise it won't work properly.
Regular Arms can be hyped much easier, they can be made chap and can be fitted with a generous mark up.
But back to the question:

Are linear tracking arms better than pivoted arms

the answer is: No

i own both types, the Rockport Sirius III linear tracking arm, a pivoted Triplaner, and a pivoted Reed.

my experience is that optimizing a well designed linear tracker can get world class bass performance.....even compared to top level pivoted arms. the character of the bass might be different on a linear tracker than a pivoted arm. subjectively one might prefer one over another.

in my particular case i did think my pivoted arms had more bass slam than my Rockport linear tracker. then i removed the silicone dampening fluid from the Rockport arm, at which point the bass performance really came alive. the dampening fluid had been slowing down the arm, both in the vertical plane but especially in the lateral plane. without the fluid to 'push against' as it tracked sideways down the air shaft the energy level increased by a large degree.

i have 2 Ortofon A90's, one on my Garrard/Triplaner and one on my Rockport. the bass is rounder on the Triplaner, but it does not have more slam than on the Rockport. the Rockport has more articulation and tonality in the bass, the slam and decay are of different character.....more life like. i've had the A90 on the Technics/Reed. there it has more slam than the Garrard/Triplaner, maybe a touch more than the Rockport, but not alot more.

if i were to draw my conclusions from my experience with the Rockport arm with the dampening fluid then i'd likely agree about the differences mentioned above on the difference in bass performance......but not now. and......in all other matters of performance the Rockport arm 'laps the field' over the pivoted arms......but of course, it's not possible to isolate what it does from the tt it resides on.

all air bearing linear tracking arms are not the same; and unless one spends considerable time with any particular arm you cannot assume things.

"Make sure you use a surge tank with it and an air filter on the output of the tank that feeds the arm tube. You can build your own surge tank for dirt cheap by going to home depot or Lowes and buying a chunk of PVC pipe and two end caps and two air fittings."

This in a nutshell is why I have never owned an airbearing linear tracking tonearm. I just don't want to be bothered with tubing, tanks, gauges, and pumps, not to mention the noise from said pump. But if I did seek out one, it would not be the ET2. Since I don't have the scratch for a Rockport Sirius or Walker, I would go for the Trans-fi. But in the end I agree with Mike. The whole argument is specious, because "it depends". Or as Syntax said in simplest response to the OP, "no".

Ralph, servo arms have inherent problems too. The Rabco depended upon the arm swinging in a "micro"-arc so as to activate a relay that then switched in a tiny motor that drove the pivot along a rail. Thus in fact the Rabco (and the copycat Goldmund T3) transcribed a series of tiny arcs across the surface of the LP, which may place even more stress on the cantilever than does a well designed air bearing tonearm.

Hey 213 Cobra (Phil), I too was a friend and customer of Julius' in his end stage as a manufacturer. Over a period of 5-7 years I bought two amps from him, a stereo unit and then an H3aa. I have a vivid memory of standing in his shop space while he helped me box up the H3aa's, so I could carry them to my car. There were home-made power transformers that had been recently wound and "dipped", hanging on a wire to dry. The place smelled like a freshly tarred road on a hot summer day. He was a very sweet guy, a real "class act". Just a month ago I was visiting a record store that is virtually across 72nd St from his Broadway and 72nd St walk-up "factory". I looked for the door that used to lead up to his 2nd floor space, but could not identify it, because the building has been modified since.

Syntax, I have no idea what you mean when you say linear tracking arms can't reproduce a "Physical Force." You need to explain what that means.

MikeL's comments are always very interesting because Mike owns so much great gear and therefore has lots of experience with listening to top notch gear. For people to outright dismiss linear tracking arms based on some theoretical shortcoming without listening to what they can do is just nonsense.

And Lewm, I understand your position. I have been fortunate to have my own listening rooms that have adjacent space available where I could park my pumps and surge tank out of sight and sound from my listening room. If I had to have the pumps and tank in my listening room, I would probably be using a pivoted arm instead.