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I've had both but on different cars. To be honest I took the MPSS out on a wet track in the 128i and with those tires I was very more confident at reasonable track speed for the conditions. No concerns on public roads.
Can't compare back to back in same conditions but had the MPS4's on the Z4M in the rain and it hugged the highway at 60mph almost like it was dry. Was quite impressive.
Both are good in the wet so I'd have no qualms recommending MPSS if MP4S is not available and the price of that tire last time I checked has gone down.
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