Which power connector?
If you have a BMW with a built-in BMW accessory socket, then the BMW-style connector is simple, easy and good. Otherwise we recommend the Quickconnect, also known as coaxial or 'male-and-female' style. It's the easiest to use (to connect and disconnect) and has lowest electrical resistance, so your gear heats up a little faster. (A nanosecond? Half a minute? In use we can't feel any difference, but we once did some controlled bench tests and there is a difference.)
There are zero reliability issues with all styles. All are tough and durable in all weathers and conditions. The SAE (Society of Automotive Engineers) style is the commonest and oldest design, and it's the hardest to push together and pull apart, but this gets slightly easier as it breaks in. It's also the least expensive to manufacture, and is the most widely available at auto parts stores.
The BMW style has one feature the other two don't...It comes apart with a screwdriver. Inside are two little set screws, one holding each wire to it's respective terminal. These make it simple to transfer the plug to another wire if anything does break. This style is slightly larger and bulkier, and by a small margin it's the easiest to manipulate wearing bulky insulated gloves.
But we still prefer and recommend the durable, compact and easiest-to-use Quickconnect coaxial style. Overall, it's the best.
Details Make a Difference: Heated Gear Power Cord Port
This hidden cord port is part of all one piece Roadcrafter Classic's and R-3's. It's a pass-thru for a short wire that connects any electrically heated clothing to the outside of the garment. The other side of this pass-thru is behind the lower flapped pocket that is on the left side.
How it works is you position either a coily power cord (#172) or jumper cord (#162) so the end of the cord that connects to the electric garment is dangling out of this port on the inside of the suit. The other end is 'stored' in the pocket that forms behind the lower left flapped pocket on the outside of the suit.
When you are ready to ride somewhere with an electric garment beneath the suit, you first put on the electric garment. Then you put on the suit. Then you connect the power cord or jumper cord to the electric garment. Then you zip the suit closed around you. Then you get on the motorcycle (or stand close to it) and remove the other end of the cord from behind the flapped pocket and plug it into the power on the motorcycle. Then you ride away warm and comfortable.