Anyways , even if the rp100 had a couple of more effects , an expression pedal is still very important ... The rp80 wins.
I don't have experience with these specific two pedals , but from what I hear is that they're very good for the money .... But if you could find a higher end model (Digitech GNX or a Boss) 2nd hand for a low prize that you can afford , that would be much better.