Don't just look at the rankings.
How much does each school cost? Any scholarships? Any stipulations with those scholarships?
Do you want to practice in OK or CA? Do you have ties to CA?
What kind of law do you want to practice? How well does each school place in that area?
The decision should be independent of your retake, IMO. If you're sure you'll do well, then you might as well save $500 and not deposit at Hastings, but obviously you can never be sure you'll do well.
Yeah, but I guess the main concern is post-grad job opportunities outside of OK. I really don't want to end up staying in this shitty state, and I know OU doesn't really have much national recognition as a school that cranks out the best JDs. That being said, I'm not entirely sure I would want to ultimately practice in CA, but I wouldn't rule it out by any means.
As far as costs go, OU would be exponentially cheaper, since I'm an in-state resident and they offered me a tiny scholarship. I believe I would be paying for Hastings at sticker with the help of any financial aid options they have.
Ideally, however, I would want my retake to land me in a T14(16?) at UT or better...