I've seen some recommendations to use #14 AWG stranded wire for the battery leads, and #16 or #18 AWG stranded wire for the motors and ESCs. The #14 gauge wire seems reasonable for the battery, but the #16 or 18 gauge seems a bit heavy for other wiring. Thoughts?
You want the nice soft noodle-like silicone wire. Easier to route but even more important, the silicone sheath won't melt back and leave exposed wire when you're soldering like other wire does.