I mean, I'd be down for either, this is my first time experiencing these games (Garou/Last Blade/Samurai Shodown) anyway.
If II is the runaway favourite I guess it is kinda odd. Is V Special a particularly bad game?
I didn't knew that you weren't familiar with the SS series, so let me give you some context for my previous post.
SS5 Special is OK, but isn't the best one IMO. At the same time, the fandom is fairly divisive when asked "What is the best SS and why?".
But the fact is that SS5 Special have a huge reputation among the neo community, since it was the last neogeo release, the AES cost a shit load of money (so it have the BIG TYMER seal of quality of the fandom and mediocre games get a free pass) and had almost all the previous characters of the series. But it retains all the bad stuff from SS5 (the stamina gauge, the shitty new characters, terrible backgrounds and audio).
As why SS5 Special was picked and not SS2, probably is that have the "modern" SS look (animation still looks great after all those years) and the large roster. Of course, I will buy it day 1, because vita and SNK is a match made in heaven.