That's not a spoiler and it's incorrect. Esper existed before magicians, who tried to emulate their power with magic and there is also the Pure World of science, so science came before magic. Said that, Aleister surely applied magical knowldege (like the Tree of Sephirot and Gnosticism) in his plan and in AC's esper powers development (proof of this are the Awakening, the Imaginary Number District and Kazakiri), but they are scientifical; magic-based scientifical powers if you prefer, but still scientifical.

haha I want to just say this; Why does there have to be a side? Why can't we all just get along for the better.

(Btw I would want to be on both sides anyways, My body would be ruined but w/e/)

Too many world-dominating agendas involved for that too happen.

D I like this. I want peace for the world too! =]] It's just, I wonder what people would choose if they had to take up a side. 

Now that I think of it, I think I'd rather be on the science since I tend to like things that can be proven scientifically. Also, the choice is due to my fond of Accel's ability and full-bodied Imagine Breaker! ;))

I find some of the responses funny here actually, about how science and magic clash in this world. The symbolism behind it is also hilarious, and especially the whole double endevuogh on how magic is more of a science than science in the cannon of this universe.

But what I think people forget the most, and this can be hinted in komoe's teachings in the first season: it states events in history, that wouldnt have happened, unless the people in said universe where born with powers to begin with (on the science side). You can also draw this: everyone in the universe has powers, but they develope them differently. Espers use a 'personal reality', or what could be interpreted as a telekinetic power, that would manipulate the world (through META physics if you will) to create a result. Some jsut shoot lazers, some are pyro kinetics, some teleport: this is all possible through META physics! pyrokinetics are really just the control of the oscilation of atoms in a concentrated area, and the lazer could litterally be the compression of hydrogen to create a burst of plasma (much like accel did in the trainyard fight), and teleporters just moving atoms, and rearranging, keeping the flow of the nescicary electricity to stimulate the nervous system in the proccess.

But I really do find it funny, that if the principles in this show could happen (I mean personal reality), that it isnt that far fetched from the world we live in.

SIDE NOTE: funny fact, if railgun flicked a coin using columbs forces, the impact would be about 70-90 (I am doing rough calculation on my guess of how much the coin weighs) times as hard, because of the sheer momentum from it.

Science side because the magic side makes me cringe too much. Characters are not that interesting either. Their power too boring since a lot of mangas and books I read have them. As much as I like mythology, I do not like how the serie does it. I love the powers in the science side better because with one power, good users can do so much. People who don't understand esper powers are just too lazy to read about them. 

Villains on the magic side are so simple and lackluster for most part to the point where I think most of the kiharas are better ones. If I have hear taking over the world once again....Academy City seems to be a fun place....Overall the only magic side character I like is ollerus, thor, and Brunhild. Some others are ok.

Only Gemstones existed before magicians. 

^ Who are essentially naturally born and activated espers (lol Mutants)

I would just like to point out in the real world, Magic is a form of Quantum Physics (although it predates Physics) if you observe what it entails, just it's not Science, because, though it can be observed, it can't be measured & for it to be science it must:

1. be measurable: which magic can't be YET

2. be repeatable: it is 

3. be observable: yes again.

So if Index/Railgun/Accelerator follows this, then it could explain the similarities & Alchemy' is just Magic+Chemistry, although it predates Chemistry. I would also like to point out that esper powers come from the power of the mind through AIM waves produced by the mind, in my theory about how only rare living things can do it, like a mutation if the mind to be more advanced, like how the AIM waves are probably a form of Electromagnetic Waves like light being converted into other things by the electricity in the Brain, while M'agic come from using Mana, life energy & the power of the Soul, to manipulate the world around the user. Basically Magic & Esper powers go different ways to achieve the same thing, One's power of the Mind, the other the Soul.

So it's not Magic vs Science, but Mind vs Soul the reason people can't be both is because they put a strain on the Body the host of both, the AIM is Permanently active, but Mana must be used to strain the Body, the Body probably can't handle the strain for an ordinary human Body

P.S. I wonder if there's an 3rd group of Martial Artists & Body Builders abut the power of the Body

I'm team Imagine Breaker F.Y.I.