5700 v 5701 Rear Mech

Looking to change the rear mech after 10k miles, as the current Tiagra mech was second hand in the first instance.
Narrowed it down to either of the 2 mechs but is there any difference between the 2?
Narrowed it down to either of the 2 mechs but is there any difference between the 2?
0
Posts
Wiggle:
CRC
Everyday Commuter
RD-5700 (-L (black)/ -S (silver)) (SS/GS - Short/Long cage)
RD-5700-A (-L (black)/ -S (silver)) (SS/GS - Short/Long cage)
RD-5701 (-L (black)/ -S (silver)) (SS/GS - Short/Long cage)
I'm 99.9% sure that all of the "10 speed" are usable with 8 or 9 speed drive trains though (as Wiggle have done)
Everyday Commuter