Wait for the OP 8 - coming next month (viruses notwithstanding), unless you're definitely going second hand, in which case the 7T Pro has little to offer over the 7 Pro. The 7T Pro has a macro mode for the camera which the 7 Pro doesn't and a marginally faster SoC. I had a play with macro mode in a shop and thought I'd get some use out of it. Others may not.
Otherwise, super-duper phones and very smooth. I was caught by the auto brightness bug on mine, where the screen keeps dimming right down when you exit certain programs (games iirc) and it's quite irritating. I'm not sure how they're getting on with fixing that.