As expected, the worse the NAND, the higher the battery life cost.
MLC > TLC > QLC.
I keep saying it, but QLC is just a bad idea, period. The controller cost/performance/power consumption overheads are simply too high to justify the cost savings, even at high capacities of 1TB or more....
* For now.
Like it or not it's all that'll be available in a few years. The cost savings will increase over time as well.
The performance for reads matters a hell of a lot more for 99.99% of the market, so the low sustained sequential speeds of current products really don't matter.
Desktop: Z170A Gaming Pro Carbon | 6700K @ 4.4 | 16 GB | GTX Titan Xm | XSPC RX360 | Heatkiller R3 | Samsung 4K 40" | 2048 + 240 + LSI 9207-8i (128x8) SSD
NAS: 1950X | Designare EX | 32 GB ECC | 7x8 TB RAIDZ2 | 8x2 TB RAID10 | FreeNAS | ZFS | LSI SAS