I see the similarity. They're both in my top 5 characters from their series'. However at max power, Enel could defend well enough but I don't see him being able to take Aizen down. Even base Aizen would be difficult, let alone his max. I'd give it to Aizen with effort.
This battle goes to Enel. Not only does he have a massive speed advantage, but mantra as well. With morals off, he is all the more willing to spam his deadliest attacks like El Thor which is enough to fry Aizen.
So Team Aizen Vs Team Enel?
Lets see who has the better debate!
I see enel being able to take this. His mantra is on an entirely different level not to mention he has to see the ks to actually be harmed by it. Enel can fight with his mantra eyes closed.
And its not so much the el thor but the effects of the el thor. Physically it won't do much to his exterior but the electricity will fry his brain instantly as a side effect. No matter how tough his exterior the electricity also effects the interior on a whole other level.
Well technically the mantra can predict the ks. Because it goes based on the intent of the enemy and it tells you how the next move will affect you or how much damage you will sustain from taking it.
But i still think lightening will have an affect on aizen. Outwardly he is durable but lightening can zap his brain.
Other than the lightening speed and lightening effects though I can't really see him beating base aizen. However that kind of calls into question how non monster aizen can beat him. Surely not with sword slashes because he can dodge those. Even in the ks enel has been shown to rely on his mantra which is island level. Dodging the sword slashes while under an illusion won't be a gigantic problem however kido will probably be a great smack down on enel.