I've liked all the ones I've had. Some taste reasonably "meaty", but others just do their own kind of veggieburgery thing, and that's good too!
I like the ones they serve in my workplace's cafeteria, but I don't know what the brand is. "Price Chopper", a major supermarket chain, has their own house brand. I think I've had "Morningstar Farms" burgers too, and enjoyed them, but nowadays I really look for vegan ones (no cheese, no egg), and sometimes that narrows it down. If I remember right, some of Morningstar's are vegan, and they're clearly labelled as such. Or that might be Price Chopper's house veggieburger... If egg and milk are okay for you, then you'll have more options.
Beancounter's post brings up a good point, actually: are you looking for something that tastes meaty, or something different? I'll confess I do like the meaty ones (waitaminnit... do I even remember what meat burgers tasted like?...) Some time ago, I had a Burger King veggieburger, and it was quite good and burgery-tasting, but I can't remember if they're vegan. BK's website should have that info if you need it.