Just an observation here, but????????

I favor suspended ones.  Its like a car.  Would u feel the bumps in a car with great suspension or with great mass but no suspension ?  The WHOLE mass resonates.

Buy one of either, then jump up & down as hard as you can right next to it while playing.  The one which is affected less is obviously the more isolated (hence better at isolation) than the other one.  

I believe Linns & Thorenses are still almost unbeatable in terms of price/performance.