MobaXterm is awesome. Except the performance is just crap. It's noticeably laggy doing basic things like opening tabs and stuff. Anytime it has to redraw/relayout it's just slow. And if you use RDP, the CPU just burns even when idle.
I pretty much use it mostly for ssh and have never noticed any lag. There are one or two oddities, but I can live with them. It's miles better than plain old PuTTY.
If I'm doing RDP I use RoyalTS, another thing I paid for because it does RDP management so well:
It's so promising though, I paid for it.