Yeah, I've played with both, all be it a while ago on the Arcane. The arcane is technically a wakesurfer, its got heaps of volume, its very buoyant & will get going on the smallest wave. Its quite skatey with the standard twin tip size fins in, especially with all the volume in the rails! Fins are mini tuttle, so you could easily swap them over for something bigger - which you would want to do if you were going to use this with a kite in chop or small waves. Bigger fins will help you keep it pointing where you want it to & let you carve without sliding out
I'm not quite sure which of the Nobile skims you're thinking about, there are a couple of different ones from different years. I've played about with the first 2008 nobile skim (130cm?) & the 2010 154cm waveskim. These are wood cores like a TT, rather than foam, so no float as such. Easier to hold a rail than on the arcane, where you rely on the fins a bit more. They feel much more familiar if you're used to twintips, but you won't get the same super early pickup on a small wave. You can [noooooo!] put straps on the nobile wave skim. The arcane has a concave deck which feels super secure underfoot. The skims are much lighter in weight than the arcane & a bit more ding resistant - although for a surfboard construction the arcane is built like a brick privy.
I'm using a Circle One 52" skim at the moment which is really entertaining with a kite & is a proper skimboard ie. no fins, straps, fancy rails shapes, concave or any other 'unnecessary' gubbins. The learning curve is going to be steeper than a board with fins but it's properly fun & involving... Check out this vid over on LTS for some idea of the waves you can take (or not) on a skim The circle one skim is holding up ok to kiting (some heel dents from mistimed airs), although if I was buying again I would get the bigger & tougher 54" bamboo one, which wasn't around at the time.
Aloha
Dan