I've usually aimed at six, but I miss pretty regularly.
I went six for both, but if I were to average it out that's probably more like 5.75 for before and 6.5 after. That's more a matter of finding more and more people I wanted to play with than anything to do with either ruleset, though. I know that in recent years I've had long stretches of six or seven and even a brief stint with eight, but also had one of those groups running with as few as three players for a while earlier this year. Pre-3E, I think it was a pretty steady five to seven, but probably with a lot less time at seven overall.