Light auto doubles are very fast, heavy auto doubles are really slow and reactable, and medium auto doubles are somewhere in between.. kinda quick but not as fast as lights, you learn to see them. Light linkers hit once, medium linkers hit twice, and heavy linkers hit three times.
Through time you learn to recognize certain characters' auto doubles and linkers you kinda just gotta learn to scout, but survival and/or training mode are really good ways to train your eyes to see stuff.