Crystals are a direct signal with no lag and will always be faster then signal searching 2.4 setups the newer 2.4 stuff from all the companies is so fast though that u can not tell the difference except spektrum which if driven back to back versus crystals i can tell
on another note the newer top end servos lile the ko stuff are making up for the tranmite time lag with speed
i still run crystals and if there was enough fm channels to have no misshapps all the pros would still run them also if there sponsors would let them