I found Luffy (and op for that matter) more interesting, but without a doubt Naruto is far more admirable as a person.
I know Luffy is doing "good stuff" all the time but that's just because they tend to overcome him on his adventures whereas Naruto is fighting to make the world a better place, so in that aspect I admire and have a lot more respect for Naruto.
Luffy his character is more realistic tho , what Naruto wants to achieve would be only mere dreams in a real world perspective but its a manga so it doesn't really matter.