I have a match grade AR that requires more attention. If ii purchase another one it will be a Colt since i really do not need to have 1/4 inch groups or less for a battle rifle. I have served 19 years in the Military and that rifle has never failed me...I have friends who own dpms,bushmasters and others and the quality is just not there. (price is better).
As far as the lower goes who Cares what one you use. They are just a place to put the internals into...
When I purchase Firearms I always purchase the ones that have the higher resale value....