I wanted to upgrade my Hori NEO II fighting stick and wanted to know what's the best buttons to go for
There is no 'best' in this instance - they are roughly equivalent, but have a slightly different feel. I'd say the Seimitsus are ever so slightly firmer. It's almost entirely personal preference which to go for. Personally, I have sticks with both Seimitsu (PS-14GN) and Sanwa (OBSF-30), and both are absolutely fine. I don't even consciously notice switching between them any more, although I probably slightly prefer the Seimitsu setup.
I agree it is personal preference but wanted opinions of others. If truth be told then simetsu and sanwa are Japanese and here in UK and prob USA aswell the arcades we grew up playing had bog standard 32mm micro switched buttons and my personal preference is to them as im just so used to them. but alas they cant be fitted into a NEO II