For me personally; it would be Louis Tomlinson cause he's really funny and i like the fact that even though he is the oldest in the group, he can act like the most childish one. Furthermore, he seems to care a lot about the rest of the 1D boys also i really liked his solo in más Than This.
Liam. Of all the boys He is the the most sensible, and responsible, and He takes care of Himself, such as exercising, and staying active. To me, someone Who does that, won't very likely go to pot.
for me all of them are adorable but if it is about one person i"ll choose...umm...louis tomlinson because he is funny and makes me laugh amd he's smart too