.Obj files should load no problem in Anim8or. Just what kind of problems are you having?
As for Blender, well, that's a commitment. The very basics of 3D modeling and animation is the same, but the implementation is very different from Anim8or. There's a higher learning curve, but Blender is more powerful than Anim8or in nearly all areas. Anim8or is better for beginners. If you're serious about having a future in 3D (professional/studio), you should start learning Blender or one of the commercial (read:expensive) 3D suites like 3ds Max, Lightwave, Maya, or Cinema4D. If you're not so serious, just sit back and enjoy whatever works for you.
The Blender installer is about 63 MB