"No brainer" - Why?

• Much better processor - Use case says there would be no difference in real life performance at all
• Ability for 2 external displays - Most non-professionals do not use 2 external monitors. If they will, then yes, this is a good reason
• Nearly the same weight - but not nearly the same size. Air 15 has over an inch larger screen. The 14 is closer in size to the Air 13.6. In person it is a big difference.
• 120hz vs 60 - no going back - Really? on a laptop I didn't see much difference side by side. Maybe for gaming or sports watching, but 60 is good enough for most uses.
• HDMI port, good for travel in hotels if no airplay, or even at home in general - Agreed but a small adapter fits in any pocket on you case or sleeve. is that worth the extra weight and thickness?
• Additional usb c port - Same as above
• Keyboard is nice (on both) - That is personal preference. On the 14 the keystrokes needed felt longer and the heavier to me. I liked the lighter feeling on the Air.

Depending upon use case and personal preferences, I think the decision could go either way. That is not a "no brainer." IMHO.