I think if you have to choose between those two, then I would go with Advanced Nutrients - well, I think that's why you mean by advanced hydroponics, anyway.
Fox Farm is also good, but I've seen stronger results with Advanced Nutrients than I have with other nute lineups.
And I hear you about money being tight, but just investing in a few basic nutes from AN, you can save money and max out your grow. That's what I've been doing and it's what I continue to do. Granted, I'm making more money now, so maybe it's just easier right now.
good luck!!