ORIGINAL: shannah
I use 4mm gold bullet connectors. easier to deal with all the way around. No Y connector, you don't have to rip the connector apart when you disconnect, soldering is a breeze. Plus, they are better at carrying high current loads.
Ditto on bullets. I use 5.5 mm gold since that is what all my other lipos are set up for. Easy to solder, easy to work with, and never had an issue, even on some really high amp draw stuff (200+ amps).