The deans plugs are to reduce heat from cheap connectors since they have a very low resistance. Being that there is less resistance with a Deans plug as compared to molex, powerpoles, and trx connectors, there is also less of a current loss along with less of a voltage drop.

You'll need a male end for your charger and female plugs for your packs.

Depending on your esc and motor setup, its probably best that you just opt for the deans connectors. Since the days of molex were also the days of 500 - 1500 mAh packs with mabuchi 540 motors, they should pretty much be thinning out here in the future. Molex was great back in the day, but they simply don't hold up to the current that hot motors can pull today... AND the packs have a way higher capacity, many people end up with molex connector meltdowns!