I'm not familiar with the Novelkeys switch in person, but the Creams are said to have the best sound out-of-box, and better than Alpacas. Alpacas just sort of "Thwack" in bottom-out, they sound like a deeper Gateron Red to me. Not terrible, but not great.
In terms of feel, Alpacas are noticeably smoother than Gateron or Cherry Reds, and the spring might be more lively on the upstroke. Some people find the Alpaca springs to be a bit obnoxious, because they are energetic. Alpacas have a thin factory lube, which is a little annoying if you are relubing them, but it makes them better stock switches. And it is easy to remove.
People who build premium keyboards end up doing all sorts of stuff to the Alpacas like they do to the other switches, like relubing and filming them. The switches are receptive to that kind of modification. Those who like Alpacas say that they offer more value for the money in terms of switch feel than the Creams, although the Creams sound better. [Alpaca sound can be improved through filming. In fact, I heard a sound demo that suggested that lubed and filmed Alpacas have the best sound of current linears.]
These switches are VERY new and probably benefit from new tooling relative to other switches. I only heard about them because people were discussing GBs and pre-orders, and they were so cheap that I picked some up before they sold out. They're going to restock some time in March, I think. You might want to pick up samples of both Alpacas and Mauves. They're certainly worth trying-out. There's a GB on here for "Ghost Switch" which is a silent 67 gr version, and you can also eventually purchase Silent Alpacas, although they are in greater need of filming than regular Alpacas.
