SanDisk Extreme

The tough forged aluminum case is dust and moisture resistant and helps dissipate heat.

Seems very few have had issues with that card and the transfer speeds are much better than UHS-I cards. For the UHS-I slot, I keep SanDisk Extreme 256gb v30 cards in there in case I overrun from the ProGrade cards but for me that happens rarely.

I personally use the SanDisk Extreme 128GB cards if you’re going to be doing any UHD footage. The transfer rate is pretty good on those and they don’t tend to drop recording like some others I’ve come across. Also the adhesive mounts that come with it can be removed from surfaces using a heat gun or blow dryer, with that being said, be careful using adhesive mounts in hot days, especially if attached to a moving vehicle or bike helmet.

I’d stick with Sandisk Extreme or Lexar 1066x (both I own). I’ve used other cards but these seem to be the most stable considering how buggy GoPros can get sometimes especially in high temps.