both look OK for a budget set up to get you going.
When you get fater you may want to look at a better set up, with a lower turn motor, the ESC in those set ups may not handle a more powerful motor, but check the specs and you might be OK.
Reasonable power for the cougar should be got from either set up thou.
Happy Racing.
FYi, I run a 7.5T Speed passion in my cougar with no turbo/timing etc and its awsome and quick/smooth. the 10T would be my choice of the 2 you mention i think....
