I like Lacoste, Abercrombie, Tommy Hilfiger, and 7 for All Mankind :)
I wear whatever looks good and fits well. The jeans that have been working best for me lately are "Riders" by Lee and "Amanda" by Gloria Vanderbilt.
That is hard to say. If you ask me, I don't really have a favorite brand that I think is the best. But here are some websites you can go to that might give you some suggestions.
This a question that can only be answered subjectivally, you can ask 100 people and get 100 different answers.