by no means this is an official and detailed comparison analysis of the different speed controls, I have all three of them and tried running them all and ended up staying with SP gear

i am racing in the 17.5 class so everyone runs 17.5 from one brand or another, people are running anything from a duo, duo2, lrp x12, novak and speed passion v2 and v3 motors, but speedos are mostly either tekin or spx also most folks here are using similar 40c to 50c type lipo batteries as well

my motor temps are around 155-160 in the above setup, not sure the temp on the esc but i have the stock sp fan running on it..

i am currently racing with the same cars as well (xray t2/t3) that are running Tekin and SPX... I know off the line at start of the race my car has much more torque but Tekin 203 will pass me fairly easily once the turbo kicks in...

I think what i was trying to point out to in my observation is that car setup and driving skills are also a big part of the equation... i think you are probably at a greater competitive advantage by being a better driver and knowing car setup really well vs having the fastest speedo/motor or an expensive new car