Pretty sure Pryor is more pro-life than Kirk.
Good point, I forgot about Kirk being pro-choice as he hasn't voted on any SC justices yet.
I know that Cotton got the NRLC endorsement and Pryor has called himself pro-choice on numerous occasions in the past, and voted for Obama's Supreme Court picks and rejected Alito. To his credit, Pryor supported Roberts's nomination. Given the fact that Kirk probably would've voted for Hagan/Sotomayor, I think I might flip to undecided. I just don't know any recent votes for Kirk to base him on.
I do like Kirk's overall centrism though, and I see him as more genuine than Pryor.