Isolation devices- to use 3 or 4 footers?

I prefer having four feet on my gear that isn't rack mounted. But consider that it's the three-legged stool that never wobbles. It's why photographers use tripods.

More effective, or sounds better?
I find 3 sounds better on my Garrard 401 tables. 

I use 4 footers on my Preamp and 3 footers on my Amp because my manufacturer used 4 footers on my Preamp and 3 footers on my Amp.

That being said, I slightly off-set one of the footers to help mitigate any tiny standing-waves that the electronics transfer to the Aluminum casing (which, in-turn could be reflected back into the electronics). 

I use inexpensive footers, and they seem to work very well (converting motion into heat) - the improvements are obvious, not subtle.  My system is posted.  

My only advice may be to start with something inexpensive and see if you are satisfied before going high-end.  If the inexpensive footers are not satisfactory, expensive isolation footers will work very well (from all reports).

Very few components are physically balanced. I place one directly under the transformer (typically the most vibration to drain) then 2 or 3 more depending on weight/size of component

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Just starting to use footers myself. Started with my TT, that has 3. 

From what I have been reading (lots of white papers, feel like I'm back in school) the number of footers doesn't matter much, or really what you use. What matters most is that what you use is in the weight spec of the device.  So if the device is 10lbs and you are using 4 footers you want to be in the middle of the weight spec. so you would use footers that support 1-3 lbs for that 10 lbs device. 

Think the main reason for using more or less footers is trying to find that middle weight spec, and/or cost. Buying 3 footers will save a lot of money if doing several pieces of equipment. But also, anything that is a little heavy, should have a solid base.