Thanks mate much appreciated.I sure am, personally I'm using the 6 but I got it for $400 on FB marketplace so at that price it was a super easy choice.
What made me specifically go for the 6 over the 6T (price aside) is the 6 has a headphone jack and the 6T does not. If the headphone jack means little/nothing to you, then the 6T is definitely a better phone. Slightly nicer screen, bigger battery, finger print scanner under the screen, slightly nicer camera, etc. They have the same processor and hardware otherwise, so long term they should perform the same, get the same updates, and be near identical functionally.
6T definitely a better phone so if it's within $100-$150 or so, I'd probably get a 6T but if you can grab a 6 at a much better price I'd recommend that instead and you keep a headphone jack, which for me is valuable.
All that being said, the OnePlus 7 is expected to be announced/released in May, so it's near the end of the product cycle. If you're not in need of an urgent upgrade, I'd recommend you pick up a 6/6T on special when they dump in price, or buy the 7 which going off the rumours looks damn awesome.