Hi, I have been playing Classic rock since it was Classic rock. Currently playing in a Classic rock group presently. 50's, 60's & 70's music. For Classic rock the Delta Blues 210 model would be the better choice of those two. Neither would be my first choice playing Classic Rock. Classic rock is not the Blues.
I would highly recommend a Classic 50 either in 410 or 212 models. There are many good tremolo pedals if that is why you want The Delta Blues. Another reason is the tubes are not hanging down in the speaker blast area with the Classic 50 combos and your tubes will indeed last longer and fan cooled. (Tubes are inside the chassis)
My original 1991 (Now 20 years old)
Classic 50 has never been in the shop and of course never a tube failure either. I change them when I hear the tone change, and before a tube failure so far.
Above all keep Jammin!