The contexts are pretty different. Vergo was meant to be stronger than Law and looked for a while like he was beating Law up but Law showed his df powers had improved beyond expectation and the one shot was pretty epic. Luffy and Mingo traded blows but when Luffy stepped it up to gear 4, there was clearly only one winner. Now the suspense was around "will Luffy make it back in time to finish the Job before Mingos Birdcage?" which is a bit more predictable because the answer to that is what it always has and will be: Yes of course. This isn't game of thrones! So if you ask me it's not as intense as Law v Vergo because that fight wasn't so limited by main character plot armor and shonen trends (law losing a fight is more believable than an entire islands population dying before Luffy gets his haki back in time to save them). It will still be epic though. Doflamingo has been a great villain so seeing him finally go down will be very satisfying.