For me both Mangas are just as good, there is no one better than other just differences of taste.
If I had to choose, I would choose FT because I could follow it at the beginning and its gallery of characters is very nice.
One Piece I like the same but not in the same Level, maybe what I low the enthusiasm for One Piece is ... its Fandom.
The truth is that the worst experiences of the Fandom I've had have been in the One Piece, plus the Hispanic Fandom, that the truth, I have been so repellent that I feel bad about how sad your life, have to go and offend other fandoms.
It's obvious that not everyone is like that, because everything is very good fans, but many times I've had to meet with fans who only strike out any other story of shit, trash or insult those who like.
The same FT Fandom can be heavy, especially by the Haters, but at least in my opinion do not get to the extreme of what happened with the Fandoms of Naruto and Bleach.
Idem. Sometimes I think that the complaints about the Final is something unique to Westerners, now that I think about it, even though we are not the target audience, we are good complaining about something that maybe in Japan and the East do not see as a bad ending.
in short, after this I remain firm and I prefer More FT than OP