Simagic Alpha versus Alpha Evo?

I'm looking to upgrade my CSL DD 8nm and have heard lots of good things about Simagic but looking on their website, I'm a bit confused.

What would the collective wisdom be here - should I get the Alpha (which is 15nm) or get the Alpha Evo (which is only 12nm)? In combination with the FX Pro wheel they don't seem that different in price. I know the Alpha Evo Pro would be better, but I'd rather not spend quite that much. Would be appreciative for any advice here - thank you.