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I don't run with the electric folks, but from what I've read on site MES(Masterbuilt) is among the most popular. Learn the difference between each generation and go from there.
I can't tell ya what the best one out there for Electric is, but I've had amazing success with my MES. You can find alot of information for using them here, Bear even has a guide to the different models.
I just bought a new electric smoker, 2nd cook on it tonight. MES230G I know its early but so far so good, just smoked kielbasa in it tonight and turned out perfect.