Series, series, series

I am querying for my first Mad Max novel and find myself facing a dilemma. Do I work on the second Mad Max book, which is in draft? Or, do I return to another draft I wrote a few years back and begin a serious rewrite of Patricia?

I read copious blogs that say pitching a series is not a good idea. I'm not, but if I am fortunate enough to attract an agent, which do I work on next? I can hear many of you saying "work on Patricia" because you don't know if Mad Max will catch on enough to become a publishable series.

Only one problem with that: Patricia is a 350,000 word trilogy. And yes, it's in draft and yes it can/will be broken into three sections. I just don't know if I can condense Patricia into a single work. Maybe it will rain this weekend and I can read the whole thing cover to cover.

Either way, I need to work on a series bible of characters, phrases, events, etc. so that I have the backstory straight and know what tag phrases each character uses.

Thoughts?