I have experience using both these motors with a Tekin.
I would choose the X12 everytime. Its the fastest of the pair when used with a tekin as i have never been able to get enough timing on the Gm using a Tekin speedo.
I have not run a Flux with a Tekin, but i have run it with a Hobbywing and they need quite a lot of timing so i would probably steer clear of it.
The most succesful motor i have run with a tekin Rs is a Tekin Redline.
The redline always ran fast and never hot, it also lasted for many many runs.
Mark
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