If you're talking about at Rolleiflex, ie a TLR, then your commitment more or less stops at the first purchase, give or take an accessory or two. With the Hasselblad no doubt you'll be tempted to buy more lenses, more backs, more finders etc., all of which will cost you a fortune. So you'll need to take that into account as well as the respective costs of maintenance. Given the type of photography you do, if it were me I'd go for the Rollei.