Theory and Practice or....

[R18A1I4]

I've played my fair share of online NL and limit as well as a lot of live limit, but before I dive into my first live 1-2 NL game I thought I should check out one of these books. (The limit books certainly helped my game)

So having never read a NL specific book would you reccomend Theory and Practice or Professional Volume 1? Or would it be beneficial to just get both?