In my experience, there is no noticeable difference in operation. Closed-center hydraulics tend to be more complicated and more expensive to work on, that's all. They also tend to create starting problems, burnt up starter motors, etc. Pumps tend to be proprietary instead of generic and cost more, etc.
I was a Deere mechanic for many years. Deere's claim to fame with their closed center systems was a faster response since 2200 PSI oil was instantly available all the time. With an open center system, there is zero pressure until you put a demand on the pump. With a closed center system, full pressure in sustained, all the time, up to the hydraulic control valve.
I've got five backhoes and several crawler-loaders. Most have open center systems, but I've got two with closed center. There is no real difference in cycle times, response rate, etc.
Many modern pieces of equipment have convertible control valves that will work with closed center or open center - just by changing one large plug.
One advantage with closed center is - it's easier to plumb in extra hydraulic control valves without worrying about extra flow dividers or priority valves. All can be hooked in parallel, whereas an open center system needs all hooked in series unless there's a flow divider involved.
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