JME 3 or LibGDX?

I have made some 2d games in LibGDX and is pretty comfortable with it. But I have never made any 3d games with it or with anything else. I started out with the few resources I could found online about LibGDX 3d API. It wasn’t hard. But having absolutely no knowledge of 3d game making I think I don’t know how I would proceed with it. There seems to be very little documentation about the 3d API.
I just downloaded JMonkeyEngine 3 and it seems to have very good docs and also isn’t that hard to understand. So I am a bit confused. Should I stick with LibGDX 3d API. Is there any good resources to get a grip of it? Or Should I switch to JME for 3d and keep LibGDX for 2D only?

If you just want to make 3D games, then yes, JME3 is great. If you are trying to learn about 3D programming (fundamentals and techniques and things), start with LWJGL and find tutorials and books on that.

The thing is, I really like to know what’s happening under the hood and I don’t really like high level stuff. If I could I would actually like to write my very own api even if it was shit. But where I stand now, I can’t just devote a lot of time learning the low level opengl stuff and then get into development. So what I have decided for now is that I am going to start out with JME3. Also I am going to learn opengl at the same time.