Who's better Cook, Luffy or Sanji?
Who's better Navigator, Luffy or Sanji?
Who's better Doctor, Luffy or Chopper?
Who's better Helmsman, Luffy or Jinbe?
.... etc
Once you answer those 8 Questions. Now try answering this:
Who's better Fighter, Luffy or Zoro?
Answer is very Obvious
Also here is Luffy's Dream as a Kid vs Zoro's Dream as a Kid:
Luffy: "One Day, i will have a Ship & Crew better than Yours & we will find Greatest Treasures in the World & i will become King of Pirates"
Zoro: "One Day, i will become Greatest Swordsman in the World & my Name will reach even Heavens"
One is Destined to become Greatest Pirate Captain while other is Destined to become the Strongest
So ofc Zoro > Luffy Power Wise
Saying Luffy is Stronger than Zoro means Luffy recruited Zoro for what? To be what exactly?
Every single Straw Hat Fights & yet they are Weaker than Luffy but at least they Fulfill a Job on the Ship. What about Zoro?
It's obviously he is the Strongest guy around, the Best Fighter in the Crew
Luffy saved Nami from Buggy or Arlong
Luffy saved Usopp from Kuro
Luffy saved Sanji from Krieg
Luffy saved Chopper from Wapol
Luffy saved Robin from Crocodile or Lucci
Luffy saved Franky from Lucci
Luffy saved Brook from Moriah
Luffy saved Jinbe from Magellan or BM
All 8 SHs were against Stronger Opponents & Luffy helped them Out
What about Zoro? He Neg Diffed his Arc Villain because his Portrayal is to be Strongest Fighter in the Crew so he doesn't rely on Luffy in Combat when he was being Recruited