[Serum]

Hi Ulch! Welcome to this forum, the purpose is to provide you the answers you are looking for, so in order to do so, here is my answer to your questions;

If you are planning on running 14 cells mostly, you will find the most power and bang for the buck in the 7XL.

The 10L however will get you a bit more runtime, and the 9L will be really fast, but runtime has to suffer. The motor will get hotter as well, as with the 7XL. the 7XL is easy on the controller, and can handle the 14 cells with ease.

From my experience, once you have got a 14 and a 16 pack of batteries, you more enjoy running the 16 than the 14.. I guess the same goes for the 12 and the 14..

Although; running 12, also gives you the ability to run the XL3100, nothing but good news on this motor as well!

the 9L is a nice in between, but it will run a bit hotter than the 7XL (no worries though)

All of the mentioned motors will likely perform alike, if geared suited. They are all able to draw the max. available power from the batteries... The 7XL has got the largest magnet, which results in lots of torque.

Overall, on 14 cells, the 7XL gets my vote.

For 12 cells the 9L gets my vote. and if you prefer runtime vs speed, get the 10L on 12 cells. But trust me.. Once you got in touch with the 14 cells and the 7XL, you will love it's smoothness, power and cool temps. You also have got the ability to run it on 16 or even 18 cells, with the proper gearing and a fan on your 9920