Uh... yeah you could learn on the Amiga if you want to wait overnight for a single frame to render.
I've been using lightwave on my 3.2ghz PC and I can render a single frame in about oh... 25 seconds.

Truth is I spent years trying to learn 3d on my Amiga 1200. I learned in a week what I had been trying to learn for years on my Amiga simply because the machine was fast enough for me to modify the scene and re-render until it looked good.
I was using imagine for the Amiga though... not lightwave.