I have always run Traxxas connectors in my RC cars on up to 6S 120amp only problem I find with them is they can disconnect on hard landings!
I have also always used 8mm bullets in my helicopters and planes as they run 6S to 12S but I'm thinking I'm going to go back to bullets on the cars now as there easy to solder and hold together better!
XT60 connectors was popular god only knows why? When you get some lipos with 10awg or 8awg cable and solder to XT60 there a night mare!