The hobbywing system will suit you just fine. I like to go fast, play around in rock racer mode, and then lock it up when I hit some rocks. It's all personal preference. I like being able to hit a button on my remote and switching between modes. You do have to use a spare channel for that...
You will get more wheel speed with the 2300kv, which you may want in the future if you are just driving around a trail or need the extra wheel speed to help through a tough spot. Me personally... That is why I didn't get the fusion. I want to be able to put a different motor in if I am unhappy...
Here is a video of the puller pro 2200kv paired with a mamba x installed in an axial capra. Holmes Hobbies has a ton of videos on different rigs and different motor/esc setups.
I just built a Vanquish VS4-10 Phoenix and put a Castle Mamba X paired with a Holmes Hobbies puller pro 2200kv. The is the smoothest setup I have tried. The throttle control is insane and you can program throttle curve to give you even more control. The auxiliary wire that allows you to do extra...
It was recommended for you to go brushless, but... what are you actually doing with your Defender? For just bashing around, light crawling, and trail running I have found the stock motor/esc to be plenty in 3S. If you want more "slow control" then the fusion would be great.
Brushless is cool...
That quick run fusion is programmable and can be set for 6v or 7.4v. From my experience 6v is plenty and that is what the Stock traxxas receiver will require. Check out the link below. It is a video that rccaraction.com did about installing and tuning a quickrun fusion in a TRX4. You will...