I think the correct answer is YMMV

Seriously, I think you should try it both ways, AND try 60 before and 60 after. Everyone is potentially different. I think the differences between 30+30 and 60 and 60+60 are probably quite slight honestly, but you just have to practice and see.

Honestly, I think I am pretty good at stropping, but I still have enough variability that my stropping is going to offer up more variability than the differences between 30+30 and 60 and 60+60.