I'd probably stick with the Galaxy. I don't have one, but if I ever decide to get another tablet, I'm not going to scrimp.
My first one was a $40 Chinese knockoff that got great reviews (apparently from Chinese forced labor) and was horribly slow and twitchy (oh, and came with malware). I then got a Lenovo - can't remember which model, but it was around $120) and it will also annoyingly lag. Not as bad as the Chinese one, but to me, irritating enough that it's sitting in a drawer somewhere.
If it's something you're going to use a lot, cry once and spend some dough for something responsive.