Luffy was not trained by Garp, all Garp did was through Luffy in the jungle and told him to survive, Luffy is mostly self taught. Zoro was taught proffessionally. by 2 of the best teachers.
Luffy also has Future Sight and will have Advanced CoC very soon. That just shows the difference in talent between the 2.
There is no denying this, these are just manga facts.
Taught professionally? **** he was literally training among the adults and overachieving things as a kid more than adults were in the same Doji.
What do you mean trained professionally? All Koshiro can do is give pointers but Zoro was performing super human feats even as a kid lifting boulders and shit.
And lmaoo at learning FS after he has already unlocked basic form of Haki is such a talent? Zoro pulled shit like that two years earlier when he learned advanced Haki by fighting Daz Bones. Koshiro did not teach him that shit, he only told him that such ability to cut steel and cut nothing exists like Ray told him FS exists.
If anything Luffy had seen FS user, the first person who Zoro saw cut steel was Zoro himself. Do you realize how much talent that requires?
Zoro is better than Luffy in every way possible.