Garp vs Luffy.. who wins?

Now, before anyone comments luffy mid diffs, hear me out. Garp fought alone against BB pirates and kuzan, after getting stabbed by shiryu and still he was dominating everyone. Even if kuzan was holding anything back, garp still beat the shit out of kuzan and every bb commander there.

On the other hand, luffy struggled so much against kizaru even when kizaru wanted luffy to defeat him..

If we are to assume Akainu > kizaru.. and Akainu >= kuzan. Then we can conclude that Kuzan >= kizaru.

Therefore I believe luffy and garp are pretty close in terms of powerscaling with garp being a little stronger.

So what do yall think? Who is winning?

Also its just a simple 1 on 1, no interference from outside.