I have owned the 7TL(recently sold the unit and ordered the NEW MK II version)
I also purchased a Stibbert about 9 months ago(early MK II version) and I truly have to say I could not own just 1 of them.
Both units do some incredible things.
I find the Stibbert to be more dynamic than the Lector,however,the Lector makes me feel like I'm listening to vinyl.
Some folks who grew up up in this digital world should throw an album on sometime soon and hear the life-like timbre of music again.
The Lector leans toward this flavor.
Warm,rich,involving,a wide soundstage with an effortless way of providing detail without ever being analytical.
I have tried and still have a slew of tubes that I have used
in both units.
The Stibbert seems to like the Siemens CCA tubes(have also used Amperex Pinch Waist, Amperex 6922 D-Getter's,to name a few.
The Stibbert has a deep clear soundstage that draws you into the music with fast and articulate speed and lower octave control.
The Lector uses a 12AT/ECC81 so your choices of premium tubes is a little more limited.
I enjoy using RCA 6201(Black plates),Mullard ECC81 "1962",
Valvo ECC81 "1962" and the RCA 12AT 7 (Black Plate which are easy to get).
I don't think you could go wrong with either of these fine players.
If the Lector 7TL MK II is even better than the original my choice between the 2 may be easier to make.