I've used a SanDisk 64GB card for over a year with no issues. Before that a 32GB, which was the same. SanDisk have the largest market share in the UK by some margin (which aggrieves Samsung). I never did see intrinsically higher return rates on SanDisk cards or Samsung cards. Both brands are good, both make there own flash memory (Samsung would tell you they make ALOT of flash memory).
You however get lots of fake SanDisk cards (better brand equity), I've even seen reputable retailers get duped, which tends to happen less with Samsung.
Buy from a reputable retailer and which ever brand you choose you will be fine. I personally prefer SanDisk but I don't have a rational reason for it. 128GB will drop in price over the next 6 months (obvious really). So I'd save your money. Faster cards are better and for the small difference in cost it's worth it. Although be aware that you are not paying for better quality "memory" as per se but a faster controller.