Can you recall a single line Travis ever said? I can't. (Partially because there are only seven lines to choose from.) But I can recall plenty of Wash lines. Aside from the infamous "betrayal" bit, there were a bunch of other great ones:
"Hey, I've been in a firefight before! .....Well, I was in a fire. ....Actually, I was fired. From a fry-cook opportunity."
"Some people juggle geese!"
"Were I unwed, I would take you in a manly fashion."
That right there, that's what made Wash great, there was development with the character, a sense of history from day one, whereas Mayweather got...onscreen appearances (as much as I like the ENT characters).