You never answered my question on how many indoor heads vs outdoor heads?
If you have a unitary split and the blower is in a mechanical room / basement or has easy access, I'd take the suggested annual maintenance on a unitary split product vs a ductless wall mount unit if I had more than a couple of indoor heads.
If you spent $800 on a multi zone system to do your entire house, you got the deal of the century. Anything over 2 heads though, and I'd go with refrigeration ball valves in case you have to service one indoor head so you can still operate your system.
The reason why I ask on how many indoor heads you have is I'm a big proponent of ductless for single zone systems, but once you increase the indoor head amount off of one multi zone outdoor unit, depending on the house and why you're thinking of using ductless, if you have a well laid out duct system, I'd go with the ducted system. Less money and easier maintenance IMO. Price out a 5 zone ductless system with line sets, line hide cover, safety switches and or condensate pumps. On a new construction job, equipment and ductwork will be higher with ductless BUT the labor will be higher due to ductwork with unitary splits.
Reality is I would love a ductless for my own home, but as is, I don't really need one.