Krell fpb300/evo420e vs pass x350.5 any opinions?

Hi anyone to share his thoughts about these ?
I have a ps audio PWD mk2 liked to krell fpb300 and a wilson audio sasha on the end.I like the sound very much , but I am considering to change my amp with newer one .My list : krell evo402e , pass x350.5 ,pass x600.5 and maybe xa100.5?
I will appreciate any thoughts from people with exp with fpb300 and any of the above
cheers!