Over the 10 years I spent flying a (non-deiced) Mooney IFR in the UK and W Europe, my scrubbed trips were caused by, in descending order of frequency:
1) Strong (often cross-) winds
2) Convective activity, thunderstorms
3) Risk of icing
4) Poor vis or low cloud
If you want all-weather, having something that handles 30-35 kt crosswinds and gets over all but the worst convection is, IMO, more important than the sort of de-/anti-icing capability fitted to light singles and twins.