Swiss have some weird rules about where you can ride ie mountain paths etc. We were in Zermatt in April, and little or no signage for bikes, limited bike shops and couldn’t find any trail maps or anything in the tourist office or train stations. Certainly no purpose built freeride stuff – the French resorts much better set up for this ie PDS, Les 2 Alpes or even Italy (Pila). Having said that it was the tail end of the winter ski season, so it may have been uber swiss efficiency going on, ie no summer stuff out yet. Cost of living was mahooooooooosive, compared to Italy (Cervinia in particular) and whilst the signage and mapping appeared no better in Cervinia, my guess is that the attitude and approach to a bit of “off-piste” biking activity will be a whole lot different (as long as you do it with style).
I think, having been to both places, a guide is a must at the very least.