definitely choose what ever brand of turbo plug suits the engine . But when it comes to the hotness / coldness , to be very honest it depends on a lot of factor when your racing , then just saying use this or use that.
Few thing to consider are
a) what nitro % will you be using .
b) shim under the head bottom also to be considered
c) what type of weather your in .
d) run time .
e) performance , torque v/s top speed in relation to engine temp you wish to run .
All the above should be considered when you have got your race face on.
regards
Alex