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morgan the the 150 SS is not a newer Model than the Montauk 150. The 150 being the indication of a newer model compared to a 15. i.e. the Montauk 170 is the newer design of the 17 the same with the 150. The engine/steering controls are under deck in a tunnel/pipe with automatic bilge pump in the rear. Like Bill said the weight of these newer 150's is the same as the old 17' Whalers and therefore probably ride the same but due to the old 17's length they will have more room.
My boat is always garage stored as the Montauk 150 easily stores in a garage with room to walk all around it.
I don't want to down play the great SS but the CC has a larger weight capacity of 7-1/2% The Montauk 150 is also slightly longer (just kidding only .1" (1cm)) same width, same trailer, same spot in the garage except the CC is taller due to the console/shepherds hook. Yes the Montauk is heavier 950 lbs to 900 lbs, hence the large capacity numbers.
Bottom line they are both great small Whalers that are basically the same, except you can walk around on the Montauk and have to climb around on the Super Sport.
Morgan take a look at the whaler site and look at the pictures and compare both and see what the Admiral likes as that most likely will be the deciding factor unless she has a hobby like Bill's wife and it will be your boat.
Happy boat hunting.