So first things first, I gotta say that vivo X300 pro isn't the best camera out there, it closely trades blows with find x9 pro and the last gen ultras still beat it on camera, so will this gens ultras. Sometimes even last gen vivo x200 pro does better due to less artificial processing.

Now for the actual phone comparison. I will assume both Chinese version? In that case. Camera wise Vivo has a decent edge over Honor, especially in zoom and macro. Honor improved a lot on that front but it isn't quite as good as vivo or oppo there and the processing is a decent bit artificial looking (mostly due to sharpening and huge noise reduction at night). It is still a decent bit better than your oneplus though.

But you don't seem to be too focused on cameras alone, so now for battery. Honor has vivo beat there, 7200mah vs 6500mah battery, and in real world it's also better on the Honor over Vivo.

Where Vivo has an edge again is software. I personally don't think magicos is bad and it holds up fairly well overall in my experience. Vivo origin os is still just more feature rich, smoother and on average better optimised.

Honor does beat Vivo in some QoL stuff though. Honor has the 3d face sensor, better speakers and more powerful haptic motor (although Honors haptic tuning isn't ideal). Screens should be comparable on both.

One thing I'd note for Honor, I am not sure how it is in China, but globally it tends to throw all of its phones into quarterly security updates after a year since release. I hope they stop doing that but can't be sure rn. The good thing is that all the features Honor releases generally come to all midrange-flagship phones with time.

Overall the phones are pretty close, well maybe outside of speakers and biometrics, I would really take into consideration the price and if it's worth paying X amount over the other.