iPhone 6+ screen going out, going to buy a new phone.

This is the 2nd time this has happened with my 6 plus. The 1st time Apple sent me a new phone free even though warranty was out. At 1st I thought it was the updates messing my phone up but there is flickering at the top of my phone and the screen becomes unresponsive for a period of time. I just finished paying the damn thing off and was going to keep it for another year but I'm thinking of just getting a new one. I usually keep the phone in my front pocket so I'm wondering if there is some stress on it that is causing the problem.

I have a macbook pro and that has me leaning iPhone 8 because of the compatibility but I'm wondering if it's not worth going with a different brand? It really pisses me off because i'm a cheap bastard and hate spending money.

Just looking for suggestions on what is the best deals.