I use RideNow TPU and for the last few years on my road and gravel bikes and they have been great. In two years I have only had one flat, and I replaced the tube as the patch wouldn't stick and when it finally did, I didn't trust it.

I do NOT carry TPU as a spare as I use Co2, so a butyl tube is my spare.

The reason I use TPU is for the ride. The combination with supple Rene Herse tires makes for one smooth comfortable ride.