Honestly with the availability of roms, rom hacks, or translated rom works, I find it pointless to own certain retro games. Especially if said game suffered from weird censorship, hardware issues, or the game never was brought to Western shores. For example, I went and downloaded the SNES versions of Final Fight, FF Guy, and Final Fight One on GBA (I still own the GBA cart and have a GBA SP) but with the Arcade Colors Remix hack. Making the games look more like the arcade version, and even restored background animations that went missing. Or improving on all gameplay fronts and getting rid of bullshit difficulty spikes. There's a hack of Final Fight 2 that allows to fight 4-5 enemies on screen and getting rid of the 3 enemies bullshit many SNES brawlers suffered from.
There is rom hack of Contra Hard Corps that plays exactly like Japanese version, making the game easier, but so you no longer have to read Japanese text to play it. FTR, the Japanese version of Hard Corps allows you to die in 3 hits. The US/EU versions is one hit and you die. The game is harder for the wrong reasons. Once you play these versions, you'll never want to play their originals ever again. Nor buy them on the retro market, because they are way over priced.
Back to Final Fight. I don't find the SNES versions that bad, despite never playing those a kid. Maybe it's because I am playing the hacked versions, but I find them a bit therapeutic when playing these games on my Myoo Mini+. They work as a nice solo adventure. The arcade and Sega CD versions are still superior, but the (modified) SNES versions can still be fun, if you want to play something short and for funsies.
I've said Final Fight 3 is better than Final Fight 2, but after playing both back to back. I kinda like Final Fight 2 more, because it's faster paced, and doesn't suffer as much slowdown. Granted, I've been playing the hacked version that allow multiple enemies on screen with barely any slowdown. So that's coloring my opinion a little. Even when play the non hacked versions, I find myself having more fun with them than 3. Final Fight 2 Readjusted is the name of the rom hack for those interested. Carlos I don't like playing as. He's wasted potential and nowhere near as fun as Haggar nor Maki. I like his design, but that's all I can say about him.
Killer is Dead I find a better game than DmC (2013). The only thing DmC does better than KiD is that having more juggle options, but KiD is a different type of hack n slash and not exactly Devil May Cry style. That's usually how it is for most Grasshopper style action games. KiD has much better quantity of boss battles too. There's only one bad boss and one mediocre boss battle. The rest are between good and great.