Read what I wrote, slowly

, one more time before replying. The 1200 is inferior to the 1250 in terms of torque, power, and economy. Objective technical fact. Not opinionated. Not arrogant either.
You/your friend raises the issue of VALUE. Ie, that dirty topic of money vs performance/overall package. On that topic, I shan’t disagree: a used 1200 at c.60% of the price of a new 1250 is certainly more than 60% the bike. But we weren’t talking value.
What the OP was talking about as his rationale for changing was engine noise and poor paint quality on the tank. Engine noise on a boxer twin is never going to be sonorous, and how perfect do you expect the paint quality on the plastics of an adv bike to be? If not perfect, just repaint the offending tank cover for less than £50.
The 1200 was a fine bike. I enjoyed both of my previous 1200s and they were excellent bikes that I toured all over Europe on. But to suggest one downgrade from a 1250 to 1200 on the basis of engine noise and tank plastics paint quality is, quite frankly, ridiculous.