I tend to use Deans/XT connectors, but anything along that scale is fine. For drills you could use 14awg comfortably, but I would still make the main power lines (LiPo/fuse/link/up to distribution for the ESCs) 12awg. Spinners and big weapons in feathers use heavier (10awg and sometimes 8awg), so you'll use it up for sure.