If 15 pro is 90-95 and 16 pro is 110-115 then i'd say get the 16 pro because newer and more fancy and has a better claimed battery life due to new chip consuming less power along with faster charging speedsGiven a price differential of say 20k between both models?
But if you get 15 pro at 65-75 and 16 pro at 90-100 then i would say it's 50/50 you could save 20-25k and go with 15 pro or you can get a 16 pro for a very cheap price
Also what prices have you been quoted