The 15" MBA is a small laptop. The two laptops weigh almost the exact same and the thinness is almost the exact same. Are people really finding that the two inches of space are adding friction to their travels and commutes with the laptop?As others have suggested, chose the size you think is best for you. Look at both sizes in person at an Apple Store or Best Buy.
I have a 13" M1 MBP, but normally at home it's connected to a 27" monitor for my "real" work. But when I need to disconnect and take it with me, I really appreciate the small size.
Further, what about actually using the laptop? We tend to focus on the measurements on the spec sheet in these discussions (and some perceived way that the two inches will stop you from using it the same way as your 13"), but what about actually using the screen? A 15" screen is quite noticeable when it comes to real estate and being cramped when doing actual computing. Which, to me, is more important than two extra inches in my backpack walking from my car in the parking lot through the front door of the coffee shop or my office (OP has not indicated that they do serious travel/commuting/subway/train/flights etc. with their laptop, but have mentioned that they will barely take it outside, so I doubt it).
I have loved my 13" macbook pro and am on my 10th year of using it. I had a 15" before that and a 17" before that. I will own a 15" MBA next. When I owned a 15" and 17" (back when they were thicker and heavier than a 15" MBA is today), nothing about those sizes stopped me from using them just as easily as my 13" when it came to travel. But when I opened the lids to do actual work, I really enjoyed what the larger screens gave me as soon as the laptop was stationary and being used.
In short, I think these conversations should really focus on actual computing use cases and the benefits that screen real estate brings to the table, unless you are always on the go and especially if you are always on cramped tables such as on planes or trains.
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