Prices of both are fairly unpredictable and very erratic! The market isn't huge and is pretty saturated with everyone having a max of 500 den slots- the playerbase itself is not that big at any given moment either.
I'm not in the WW market at all, I don't spam campaign looking for them, so I can't say much else about them. I've sold a couple that I listed for what I thought was way too much given compared to the others listed in their ranges-- no cute IDs or matchy colors, but some people will pay out for cute dates, I've learned? Never hurts to try and be a little bold, I suppose!
Gen2 brachs are (mostly?) consistently higher priced than other G2s, since outside a breed changer it's the closest to a G1 people get. Other G2's aren't as widely-coveted (tho they seem more popular in general than say, on FR) -- except when they are useful for injecting new blood into popular colors that are otherwise saturated and hard to find mates for. Some people do collect them, just not like it was back on like... Wajas, where generation seemed to matter more.
Mostly posting this to spur conversation, so you get better answers. :P I'm sure more people are much more aware of the WW market than I, especially.