Personally, I like all the ones you've listed for different reasons.
I haven't played a lot with Werewolves. I'm generally not an occult player but I like having the option. The Build/Buy is pretty cool, if you like the distressed, grungy look, same with CAS.
Dream Home Decorator has some really good Build/Buy and CAS items but the career gets a bit redundant. I'm not sure if some of the bugs have been fixed.
My Wedding Stories hasn't been a huge headache for me but I've had some issues with it. I think that's mostly simulation lag though. In my current save, my sim just had a wedding and most of everything worked out. Tartosa is a really nice world. Build/Buy is nice. There are around 80 items. The CAS is nice and adds to the formal wear and party wear categories.
I, personally, haven't had a lot of game-breaking bugs with HSY. I've been mostly annoyed with the Social Bunny notification light on the phone, and the constant asking to be BFFs. Trendi and thr thrift shop are kind of fun. I don't like that prom is a weekly event and I wish it would have been an event we could plan (like birthday parties). Going to school gets a bit redundant but that's sort of like real life. I'm not overly crazy about CAS. There are only a few pieces I like but I'm old and very unfashionable in real life. As for BB, it's pretty nice. I do wish there were more swatches with the rugs but the beds' swatches are nice.
I'm not going to tell you which pack to choose but this is my opinion on the packs. Full disclaimer though, I play with mods. Before I even began playing with HSY, I downloaded mods to make it more enjoyable for myself. I use the Expanded Trendi mod and the More Classmates mod.