That's a tough one, can you audition both at the same time? Simaudio makes good stuff, benefit is class A operation to 5 watts/channel. The specs are impressive for the Anthem 325. I haven't heard either, but your listen test should be your gage.
Opinions on Sim 330A Power Amplifier
I was planning on purchasing an Anthem 325 3 channel amp to run my Paradigm 85f's and 55C center speaker. My dealer suggests buying the Sim 330A 2 channel Power amp instead. I can easily afford it if I don't buy the Lumin T2 that I was planning on purchasing and just continue with my Bluesound Node 2i for listening to Qobuz music. I respect my dealers knowledge but just want to have other opinions before I decide. Thanks