quad = 4 wheeler
do you know the difference between two stroke and 4 stroke?
when you say dirt trails, is it hard packed rutted dirt or is it soft clay and sand?
and as far as companies being better than the other one, its gonna be alot of personal prefference. so once we get some more info about the type of riding your going to do then we can start to give you our opinion about the types of bikes we want you to get.
with your size and weight dont, i repeat, dont go anywhere near anything that resembles a 250 or bigger. stay with the smaller bikes. when i say that im not insulting your strength im just trying to keep you alive