The Producers Cut of Curse (H6).
Meaner, vicious Mike
The story coming full circle
Very atmospheric like the original and H2
Spoiler...
The idea that Loomis would carry the curse, only changed because he died.
I used to love H2 and I still like the score a bit but over time its soured on me. Hospital being deserted is something that always bothered me. I love the continuity of the movie but little things bother me about it.
H4 is widely regarded as a good one and I think it's better than 5 but not better than Curse and that goes for either version. H3 is a nice one. Creepy and atmospheric.
H20 I enjoy and I would watch it before I would watch Resurrection. The remake is watchable and there were some aspects I liked but I'd place it just above Resurrection for the bottom tier of the series.
Overall though I'd go with The Producers Cut of H6 as the sequel I enjoy the most.