Yeah I have to say for pure convenience the Suke Suke no Mi fruit is probably my top pick. So many ways that invisibility could be useful. For modern life that's just a super fun ability. Can...procure funds without a problem...."Women's Bath"....avoid annoying people...."Women's Bath"....and such.
In a world like One Piece though I'd probably say Ace's Mera Mera no Mi. Going full blown fire mode against threats would be pretty cool.
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