Retro Bits Tribute controller gets good reviews from the community:

https://www.amazon.com/Retro-Bit-Tribute-64-Wired-Controller-Nintendo/dp/B084QKDJLZ/ref=dp_prsubs_1?pd_rd_i=B084QKDJLZ&psc=1

Retro Fighters Brawler controller is a popular choice as well:

https://www.amazon.com/Retro-Fighters-Brawler64-Next-Controller-Game/dp/B078KHKHPX/ref=mp_s_a_1_5?crid=KYHEX938ANCQ&keywords=brawler+64&qid=1643211122&sprefix=brawler+64%2Caps%2C162&sr=8-5

I have a brawler and it’s pretty good, takes a bit to get used to.