WeaseL,
Recommend you read this Anandtech article
Understanding TLC NAND. It's very thorough and makes clear why SSD production costs vary so much. Pages 2 & 3 are most instructive.
In the two years since this piece was writ controllers have gotten technically better but it's still an evolving technology and quality & cost continue to play a major distinguishing difference in reliability. The relative gate wear/fail issues on SLC, MLC & TLC NAND have not much changed.
Learning what's inside any given maker's hardware version isn't often straight forward unless someone has ripped one open and reported on it. Last autumn I spoke on the phone with
Team Group and they outright refused to disclose the NAND type used in their product citing "trade policy".