Best TPU tube brand

[Hendie]

I use Ride Now. I bought a case of them because I like to have spares.

I have tried ThinkRider, my success was spotty. Two flats.

[RoadieMKD]

Just a quick note, I learned the hard way that Topeak fly paper glueless patches work really well on TPU tubes. It's been 4 days since I punctured and did a roadside repair with them. Holding very well without losing air more than what is usual for TPU tubes. Just scuff up the puncture site gently to make adhesion better and that's it.

[Dan S.]

I use RideNow, 36 gram version, great value for the price. I've done around 7k on a pair, only puncturing once due to my tire being sliced open. Other than that, they are rock solid. They do loose pressure a bit quick than I would like, but I pump my tires before almost every ride anyway, so not a big deal. 

[Jet the Panda]

I've been using aliexpress tpu tubes for a few years now, recently swapped them all over to the Ridenow 36g which do feel thicker and sturdier when you get them out of the packaging. I've not had any problems with them yet.
Another cheap and cheerful option are the orange thinkrider tubes you can find them in the buy 3 bundles section of aliexpress.