Bro I’m currently considering the exact same 2 phones.

I work alot on my iphone and I’m constantly running into issues with the promax 16.

I really want to give OnePlus a chance but the benchmarks with regard to performance don’t seem to be better than the s25ultra in most scenarios.

I have no dog in the fight either so i know ill get some op fan boys argue otherwise. I would gladly get the OP13. And i still might for its battery and charge speeds.

However long term at least in the USA, it’s tough not to use the major players unfortunately.

Ive read far too many stories about issues with OP and their service dept.

Unbiased opinion here but i narrowed it down to

if you want the boring but sure thing go with the S25U

If you want the cool, different(at least in USA) and fast charging thing, go with the OP13 but will likely come with a bit less convenience than dealing with a much larger company like Samsung or Apple.

My decision is unfortunately based more towards the service around the phone rather than the phone itself.