Before you buy any system test out all those that you are considering. Be sure before you buy.
That said, do you dare buy a system that, should you decide to change, requires you to change everything. The Hasselblad H3 says you must. Can you afford this?
i.e. what to do if a better chip comes along? You know one will.
So, decide carefully, very carefully, your long term requirements before you buy. In my humble opinion (well maybe not so humble) open systems are the only way, unless your requirements are, and will continue to be, very confined. Caution is the watchword, IMO.