1°. accessibility
While you can find loli hentai anywhere. Finding ‘p takes a long time, and if you find it, it is usually cropped and/or behind a paywall.
2°. quality/content
Not only is ‘p usually filmed using an old phone or camera, which makes the sounds and visuals look bad, most girls aren’t that hot to begin with, and the guy can barely insert his penis most of the time. While with loli hentai, the audio and visuals are superb, the girl has a perfect face and body and the guy can go in balls deep and she will be fine.
3. Legality
You can have sell and transport loli hentai pretty much anywhere. But with ‘p you can’t.