i think sasuke's sharingan is way better than kakashis since kakashi only got one sharingan that drains him very rapidly while sasuke is an uchiha. on the other hand kakashi is much faster and stronger so he would probably win. if both opponents got the same sharingan it all depends on how strong they are, the one that is faster will probably win. just like lee said even tho your eyes can follow me doesnt mean your body can.