Join Date: May 2003
Location: Redwood City, CA USA (SFO/SJC)
Programs: 1K 2010, 1P in 2011, Plat for 2012,13,14,15 & 2016. Gold in 17 & 18, Plat since
Posts: 8,826
Another vote for Munich
Munich is an excellent airport; I've transferred there a number of times and it's painless, fast security (almost like, "That's it? I'm done?") and no super-long runs from one flight to another.
FRA? Yeah, I would not, ever, do 1hr at FRA unless I had a good backup plan. I might deliberately book 1hr at FRA if it was much cheaper than the flight I actually wanted to be on, which left a bit later and would likely still have seats.
Munich all the way. It's very well supported with connections. What's not to like?