I used to use irrlicht and Ogre. Both have the problem of only really doing graphics and to a certain extent input. In comparison, Unity and Unreal offer the wh

I used to use irrlicht and Ogre. Both have the problem of only really doing graphics and to a certain extent input. In comparison, Unity and Unreal offer the whole package: graphics, asset pipeline, audio, networking, and physics. Speaking from experience as I'm currently making the jump to Unity for my projects, the time savings of choosing one of the all-in-one engines instead of gluing together engines is really substantial.