IMO, the vortec/ls GM motors are the best gas v8s of that time period. I thought the 5.3s we used to have in the work trucks were good motors, decent power for their displacement. The 6.0 has a very good reputation as well, I'm 1/2 tempted to buy a used 6.0 to swap into my 72 k20.
I had a 2500 Dodge with the 5.7...it wasn't bad, it had close to 200k miles on it when I sold it. However, the interior and paint on that truck were completely shot. Also the motor liked to rev, got terrible gas mileage, and shifted a lot while towing...but those are probably complaints for any late-model gas truck. Despite the bad wrap Dodges get, the only issues I ever had with that pickup were ball joints, AC compressor, and the power steering pump. I did eventually have to replace the dash, it quite literally fell apart. I religiously used a windshield sun shade after the new dash.
IMO, the 4.6/5.4 Ford motors are gutless, spark plug shooting turds. My old man had a F150 for awhile with the 5.4, he also had head gasket issues with it. It did get better mileage than my Dodge gasser, but was gutless in comparison...it was a big disappointment compared to his f250 w/ the 460. He eventually sold the f150 and still has the f250.