Yes, I got the Pfizer, because a number of folks I know who had the Moderna, suffered more with the second shot than they did those who had the Pfizer shots.
I don't think we have the Astra Zenaca one here, at least not in NY. I don't know whether it's available in any other state. I'm surprised you have to wait 3 months for the second shot. I know with the Moderna it's 4 weeks instead of the 3-week wait with Pfizer. I hadn't heard about such a long waiting period between shots anywhere here in the US.
Oh, and I'm waaaay over 50.