trucks are a tossup, i personally hate both as far as the way they drive, interior quality, ect (ford seems to be doing better). but fuck, they're trucks. pick the most reliable for your purpose. one might have a slight edge in certain classes, but with the constantly changing engine and drivetrain options it varies from year to year.
cars, ford by a mile as long as you're talking about the stuff riding on the widely-used ford/mazda/volvo (3/5, s40/c30, new/euro focus) small car platform, or it's bigger variants (practically all the bigger new volvos, i think the 6 and fusion, definately others). these cars generally ride and handle great and are pretty damn reliable.
chevy's cars are spotty at best. the fact that cars like the aveo, cobalt, and impala are even on the market is laughable. i would literally rather take any other car in their classes that is legally sold in this country.
as for lincoln and mercury, they're a joke, honestly. redundancies that at least GM has tried to kill off (but hasn't completely. and iirc ford did finally axe mercury, right?). though i haven't been in some of the brand new lincolns, they could be nicer than their ford counterparts. but i doubt it. it's not exactly like the difference between lexus and toyota or nissan and infiniti.