Well, I have done a few rides now on some smartsams in a 26x2.35 size. I have been running marathon plus MTB in a 29x2.25 and 27.5x2.25 on a few other ebikes for over a year now. Which is better I think just depends on the conditions. For alot of the loose gravel (almost sand like at times) where all the smartsam little fingers can dig it, it definatley feels better.
On more hardpack up to pavement the marathon plus with the bigger less flexy knobs feels better.
I came up on a pavement corner tonight and had to apply front brake while in a turn. I could definately feel the smartsam knobs just roll/fall over. While applying front brake in a corner is a NONO, its the only option I have on that bike (no rear brake at the moment). Getting the rear brakes in a few days.
Will have to see how the smartsams wear, I might run them on the front with the marathon plus MTB in the rear.
The smartsams are amazingly quiet on pavement for the tread pattern, I would have never guess that by looking at the tread. Thanks stefan for pointing that out.
I do like the new Johhny Watts, could be awesome in a plus size