In winter type of gas appliances fitted can make a massive difference on how frequently you need to fill up with gas/swap bottles. I can sit for weeks running my diesel Eberspacher when I have seen Charlie going for gas every few days. Location/availability of gas becomes a big factor then also.
To me the ideal would be to have both gas and diesel to reduce the risk of being caught out. I have been running the Eberspacher ever since I bought my van with it fitted and in 3 years it has never needed any maintenance or had and problems apart from a 12v live failing that was easily fixed and nothing to do with type of fuel.