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It's just different ways of getting of, as most people already have said: ecchi/hentai allows for any fetish you want to be fulfilled and the characters can be made "perfect", but at the same time, aren't humans, the difference being that one of these you can actually fuck.
And thus, 3D porn can be even more stimulating but if you don't like either: girls being abused, or abusing girls then you're "gonna have a bad time" when looking for porn these days.
Of course this is how I feel about it, I can't speak for the rest of you.
Here are twelve images for your consideration:
