What car will it be running in?

I run both types of speedy and motor, and honestly, pick a colour you like and buy that one. They're equally as good as the other (at my club level at least.) Run the LRP more just cause.....I don't know, I like blue I guess? Have the 7.5, 6.5 and 5.5 X11's. Just put the 5.5 in my xxx4 with new lipo's and it was wayyy too much. I'll be putting the 6.5 back in. Had the 7.5 in when the track was slippery and that really helped. Was nice in the 2wd aswell.

I don't think you could go wrong with either of the two. Both good choices.