Well i dont know if mBot for cSro and mBot for iSro is different, but i used the mBot for cSro .. and also on my iSro time, Sbot.
Like the guy above said, mBot does have some nice features, but kill speed was simply ridiculous, the area for hunting had to be absolutely free of obstacles or you could be sure to get stucked every few minutes in them, also the radius was kinda useless, i set a radius to 50 and he didnt target any mobs within this radius, and just stood there and been waiting for new mobs to spawn (i mean mobs which were within my area, but out of sight/radar), .. for now i remember this issues atm ..
Sbot was on that time, fast (only tbot was faster if i can say that, but sbot was nearly as fast as tbot!), he managed to get out of obstacles mostly, very reliable, and for my purposes on that time, it was more then enough (considering also the cheap price it was simply unbelievable) ..
It depends on what you are going or looking for, the party settings/buffings of mBot are very useful within parties after 100+ at Alex, while Sbot is still the number one out of all available bots (im taking here just the last thread here where the most voted for Sbot)!