I think THE CAT PEOPLE is good, but it's a bit overrated (because it was the first Lewton horror). Some of the character stuff is a bit naive, to the point of being funny. I say that not as a critic, but as someone who enjoys the film but cringes at the laughter from other viewers.
I WALKED WITH A ZOMBIE is the most atmospheric of the bunch, a beatiful, dream piece of work
THE BODY SNATCHER I find to be the most effectively dramatically, thanks to the tension between Karloff and Henry Daniel.
By the way, Robert Wise, who directed BODY SNATCHER and co-directed CURSE OF THE CAT PEOPLE, died yesterday.
READ AN OBITUARY HERE:
http://hollywoodgothique.bravejournal.com/entry/14578