Originally Posted by
WheelsUpGal
From what I can tell the Dreamliners Polaris seats are more narrow...
They are. I'm fairly slender (but tall) and definitely notice the difference between the 781 and 77W.
Originally Posted by
WheelsUpGal
Are those seats made by a different company?
No. It's just that the 781 fuselage is more narrow, so the seats also need to be.
Originally Posted by
WheelsUpGal
...if you COULD choose, which one would you choose?
I'll take the 77W any day of the week (and twice on Sunday) over the 781. Increased seat width, those awesomely HUGE engines, plus the lack of Channel 9 on the Dreamliners (if that matters to you).
Originally Posted by
WheelsUpGal
Does the Dreamliner have the chest seatbelt? (Or whatever it’s called.)
Yes, every Polaris seat - regardless of aircraft type - has the shoulder belt.
Another reason I prefer the 77W over the Dreamliners is that on the Dreamliners, UA FAs tend to set the windows on the darkest setting, then lock the window controls so you can't adjust them. You can still see out, but it sucks for picture-taking. The 77Ws still have the old fashioned pull-down shades. 😎 Case in point:
View from 781 with window set to dark and locked by FA (no filters applied to photo):
View from 77W:
If none of the above matter to you, then go for the 781. The difference in cabin pressure / humidity is definitely noticeable and I felt much better after an 8+ hour flight.