As someone who has travelled quite a bit for work, I've been in many Hotels (this is the UK so everything is smaller than in the US) and I used to roam around with a massive 17 inch Alienware for a few years. I can categorically say the Steam Deck is a better experience.
When in cramped Hotel rooms, I can just sit in bed and play, I don't need an entirely separate laptop bag for it, fits in my work bag or luggage, Doesn't need to be plugged in and certain games can even play without needing it to be plugged in for a couple of nights.
I'd argue the Steam Deck is much better vs a gaming laptop for actual "on-the-move" use.
Don't get me wrong, if you have the space and can be bothered to lug around (I did this for years) a gaming laptop, yeah its a better experience with headphones on, bigger screen and cranked up graphics.
But truthfully, in my experience, the Steam Deck is the superior experience when actually being used on the go. By a mile.
I was also surprised to find myself sticking with SteamOS as well, I thought I'd be wanting to move back to Windows but actually, everything I've wanted to play has worked on the Deck (Stardew Valley, Mass Effect, God of War, Stray, Valheim, Kena, Crash Bandicoot, Spyro, Ni no Kuni and Horizon Zero Dawn).
Honestly, it's an impressive bit of kit.