My biggest gripe with my AT&T service is that the second I walk into my house my signal disappears.
I have to set my phone to Wifi calling to get signal. I never had that problem with Verizon. But, it's a small price to pay for what I'm saving over Verizon given my AT&T employee discounts. Mtnbkr used to work for Verizon and he said that the cell service discounts he got as a Verizon employee... well, he didn't get any.
My AT&T service also isn't that great when I visit Castle Key's area. It's pretty rural and bounded by a lot of water, so not a lot of places for cell towers. If I move down there when I retire (strongly considering it) I'll probably get a cell signal booster for the house no matter what carrier I have.