Honestly if for PUBG, you should go with iPhone 11. It’ll run smoothly on it. Plus, iOS is better optimised. With op7t, you’ll get similar performance. But, it’s only a matter of time till it starts to lag. Also, keep in mind that iPhone 11 has a lot smaller screen and the display isn’t as good as you’d expect. At least, it didn’t stood out as of my expectations. And it’s apple economy we’re talking about. It’ll be all for money my friend. If you ever used an iPhone, you might be similar with the platform. For me, I used it for couple of hours (3-4 to ve exact). But, i couldn’t even find the freaking files in that device(iphone 11) to free up space and all.
Conclusion:- if it’s only for gaming, specially for pubg, you can go with iPhone 11. But for everything else, op7t is well ahead of it.