Pass labs X150 vs. Threshold S/350E

Hello, I owned a Threshold S/300 for several years then sold it about a

year ago.

I drove a pair of Acoustat model 2+2's with it. I am now considering between

a used Pass Labs X150 and a Threshold S/350E. The S/350E was

upgraded by John Soderberg. Both used pieces go for about the same

price and both are rated 150wpc into 8 ohms. I liked the rich, warm

sound quality of the S/300 with my Acoustats.

Which of the 2 amps would be the better

choice as far as rich, warm sound?
 
I believe that Pa recommended JS several times, so that's a plus

consider one major difference between two amps - S350 is non-bridged output while X150 is

by nature, means that you can expect less warm sound from bridged one

though, listening test is sole way to check that , with your speakers/rest of system