I've owned OnePlus phones since the OnePlus 3. I've owned the 3, 3t, 5, 6T, and the 7T. Will be buying the 8Pro shortly.
I've owned LGs, Samsung's, HTCs and, Apples in between. And by far they are the smoothest fastest and functional of all of them. Sure in the past Samsung's have more features, but you pay very high premium's for them and they really don't get used as they aren't really necessary for day to day use. Apples integration is great but their phones suck. The only plus for them was their cameras and now that advantage has been shaved to nil. If you want the best camera it's not even a Samsung or iPhone that holds that claim. Not OnePlus either, but their are better options in that department.
Pros.
Updates are fastest among all Android phones except for Google's own phones.
The UI is superior to every phone, period. Apple integration aside, Apples UI is ancient and lacks a plethora of functionality. Samsung's UI while improved is still a resource hog and is filled with bloatware that you'll never used. And white in the beginning, their UI is quite smooth over time Samsung's have issues with slowing down, having poor Ram and Cache management.
Battery life stays consistent on OnePlus phones. The speed of the thing helps in that regard, using resources for shorter periods of time. 5G while powerful and power hungry also uses resources and power for shorter periods of time. So while it's active it's drawing hard , it does so in such short periods of time that it actually ends up using less power a concept that many forget to include in their calculations.
The display of the OnePlus 8Pro is the very best in any phone available. 10bit color display at 4k and 120hz is insane! The 10 bit screen alone even when matched with Samsung's display while essentially the same isn't displaying at 10bit like OnePlus. The difference is very noticeable side by side.
Wire less charging.
Then there's the Fast charging. Samsung's can't match it whether Wireless or Wired. And Apple? They're a joke. That is the main reason I'm buying the 8pro. I play some very power hungry games on the go, like Ingress which far more power hungry than Pokemon go or Wizards Unite which are three most power hungry games ever. The OnePlus 7T handles 6 hour sessions easily with 50 percent to spare, while a Samsung is near dead at the same time frame.
Price. Well it is way more reasonable than S10 Ultra which is featured paired, not the S10 which is not. If deciding against the Ultra the price wins automatically as that thing starts at $1000 or is it $1100? I forget, either way, you'll get a better phone with as good a camera and better battery life at 200 to 300 less. Nuff said.
Water-resistant ip68
Cons.
No expandable memory (but do you really need it nowadays?)
No headphone jack. This used to be a deal breaker for me, until I started using dedicated Bluetooth headphone DAC/amps. the EarStudio ES100 is incredible and I'll never call a phones amp Good ever again. The Fiios BTR5 is also a beast too. These devices power even big power hungry 600 ohm electrostatic cans that.would be a whisper if plugged into a phone. Bluetooth audio has gotten so good that if you have a good DAC it has actually risen to audiophile levels. But you gotta have the DAC. And without a strong enough amp to drive the headphone? Well good DAC aside it's still going to suck without the amp. I have IEMs with 5 drivers a side and though they aren't super power hungry, with ample power they come alive in ways that you won't believe until you hear them.
Anyways. I highly recommend OnePlus phones
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