Ultra Street Fighter II: The Final Challengers is hands down the best version of this game that has been re-released over a dozen times. Yes, it's a port of the HD Remix, but improves on further by adding so much more content, ironing out any gameplay issues the HD version has, you get Evil Ryu and Violent Ken, two new modes exclusive to the Switch exclusive (one of them being Dramatic Battle called Buddy Battle), and has a color editor! You can switch between classic or modern visuals, so even if someone does not like the HD redrawn sprites and visuals by Udon, you can go to the classic pixels at anytime before starting a game.
The only knocks against this game is that you don't get the Overclock Remix songs from HD Remix (not a big deal because the soundtrack you can get online easily) and Dramatic Battle's lack of a continue. You and your co-op buddy share the same life bar, a la Street Fighter Alpha 1 & 2, but if either of you get KO'd, then you're sent back to the title screen. No matter the difficulty setting. Why Capcom? It's one thing to punish a player or players for failing, but there is no reason not to put in a continue option. If you're playing on the harder modes, it makes DB much less fun to play compared to the variations of it. The Alpha games never gave you automatic game overs, and allowed to continue at anytime, or as long as you had quarters on you. This makes Dramatic Battle the weakest out of the franchise though. Still fun, but irritating game design that was not needed.