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Another thought, is that the 15" is hard to use on your lap. The screen is gorgeous though. Another issue is the larger body makes the touch-bar harder to reach from the trackpad on the 15" vs. 13". There is just more distance for your hand to travel.

strictly for lap use scenario, arguably the small size 13" is actually harder to use on lap, the new 15" Pro is very slightly larger than 13" Air which is perfect on lap.

older 13"Pro is a bit smallish but still ok, new 13" getting even smaller, your feet have to be so close together or the laptop will slip.
 
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