With other options out there I initially went with EC3's which I still like but then went to XT60's because when I order Lipo's that is the usual connector already on. Inprefer both over the Deans as they have a solid connection but still are easier to disconnect.
I am curious. When you drill the hole, how close does the drill bit get to the actual metal contacts inside the plastic? I would be concerned about shorting out the Lipo.