I own this, and I've never watched. I want to, I've been wanting to. I've been wanting to make an occasion of it's viewing. I think Lupita is much lovelier than Helen Chandler.
I agree with you. She's also a much more engaging actress. She's also, amazingly, still alive. This version is really better than the English language version, except for the performances of the two Dracula's. I love Dwight Frye, but there's something about the Spanish Renfield that makes him seem more dangerous. The atmosphere is thicker and there's much more energy to the movie as well. I haven't watched it in over five years and need to again, soon.