I would go for the 308.
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I owned a 308cr and it is very conservately rated at 150WPC. It will handle quite a loadits pretty hard to clip it. The problem with that amp is that it seemed soooo sterile. I found it so neutral that I had to sell it and get a warmer richer tone. I did that but stayed with SS for a while. The guy who bought it said it was a bit on the warm side. True story....
Djtiti is 100% right try and audition them. Our choice has nothing to do with your choices. Sure there is a consencus mainly driven by a buch of people who loudly declare what is good and what sucks. I stopped listening to that stuff and now I have nirvana. Use your ears to guide your system choices.
Generally the only way to "audition" used gear you are considering is to buy it. Then sell if it is disappointing in your setup. Been there done that. It can be a confusing, tedious and frustrating experience. Or, it can be rewarding when you get lucky with a good match (that word synergy). The only way to know is to go through the trial process. As Mechans said, the MF 308r produced a neutral/ too-sterile sound in his setup, and then with the fellow he sold it to it was "a bit on the warm side." So any recommendation of one component over another will be system-dependent which practically negates the value of said recommendation.