The carts are pretty comparable in terms of weight, compliance, and tracking ability (neither is a great tracker). There should be no compatibility problem with your arm.
Overall, I find the voicing of the Benz, with it's vibrant midrange, to be more fun, but ultimately prefer a more neutral midrange. (I should mention that I have the low output Dyna, not the high). I haven't tried any other high output carts in that price range.
Have you considered any low output MCs? I think they are preferable to the high output versions in most cases. It looks like the Phenomena II should be able to handle low output carts.
Overall, I find the voicing of the Benz, with it's vibrant midrange, to be more fun, but ultimately prefer a more neutral midrange. (I should mention that I have the low output Dyna, not the high). I haven't tried any other high output carts in that price range.
Have you considered any low output MCs? I think they are preferable to the high output versions in most cases. It looks like the Phenomena II should be able to handle low output carts.