I've tried both, not the xmas buffet but the regular one. Melt
was about 48+ if I remember right, and Goodwood about 38++. I found
both reasonably good - Melt is $10 more expensive but has a
slightly wider selection including oysters, sashimi and a chocolate
fountain.
Back when I tried it (couple months ago) both buffets tended to
emphasize Asian rather than Western cuisine.