Having worked at both, I'd normally advise one to choose the one with the easiest commute.

However, given your unique circumstances, I'd say go with Republic. They're currently hiring into the 170. Given that you're looking to get current and get out, and the fact that you listed Jet Blue as somewhere that you're interested, the 170 experience will boost your resume.

Further, with the talk of furloughs at Pinnacle, I'd be hesitant to go there when RAH is planning to hire 400 through year end. Your relative seniority will move up at RAH quickly on the 170 as they hire underneath you, you'll get 170 time which can help your applications to Jet Blue and US Air, should either of those interest you, and you won't be worried about a furlough after training.