I’ve got a rigid 29er, although don’t score too highly on the STW niche-o-meter as its got gears.
It was eye-opening as to how much better to ride it was than my old 26″ bike.
Then the new-bike-itis wore off.
🙁
It is different, my 29er feels a bit taller, and does roll over some things better, but on a normal, reasonably mixed off-road ride I don’t think there’s that much difference. Maybe if you were riding a DH track repeatedly or on some very specific terrain you’d really have a preference. Like needing a fatbike for sand dunes or something.
Tyre pressure and how knackered you feel is probably more noticeable TBH.
I’d probably buy a 29er next time, mostly so I only have to have one lot of innertubes, but not because it’s loads better.