A In terms or write performance, durability and price SLC > MLC > TLC.
SLC, MLC and TLC refer to the structure of flash memory cells and how many bits each cell can store. SLC stands for single-level cell which stores one bit, MLC stands for multi-level cell which stores two bits and TLC stands for triple level cells. A bit is a 0 or 1 and so 8 billion cells are required for one gigabyte of SLC flash storage. As the number of bit levels within each cell increases, fewer cells are required to store the same data so there is a decrease in manufacturing cost per MB. SLC flash is also more durable and can reach up to 100,000 program/erase cycles compared to up 10,000 cycles for MLC and up to 5,000 cycles for TLC devices.

TLC and MLC devices are consumer grade products. Despite the lower durability of TLC flash, it is absolutely sufficient for use as a bootable disk which infrequently changes. A consumer may achieve better longevity and therefore better value for money from a larger TLC device than a smaller MLC due to how the memory would deteriorate over a greater number of cells.

SLC flash devices are generally only used at enterprise level and carry a premium in return for increased endurance, faster write speeds and lower power consumption. eMLC stands for enterprise multi-level cell and has a two bit level structure. It has enhanced durability (up to 30,000 program/erase cycles) at a higher price than comparable MLC.

The Best.
CPUGPUSSD
Intel Core i5-9400F $137Nvidia GTX 1660S (Super) $240Crucial MX500 250GB $45
Intel Core i5-9600K $210AMD RX 5700 $370Samsung 850 Evo 120GB $150
Intel Core i7-9700K $340AMD RX 590 $186Samsung 860 Evo 250GB $51
HDDRAMUSB
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3000 C15 2x8GB $65SanDisk Extreme 64GB $88
WD Blue 1TB (2012) $40G.SKILL Trident Z DDR4 3200 C14 4x16GB $612SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $85Corsair Vengeance LPX DDR4 3200 C16 2x8GB $68SanDisk Extreme 16GB $24
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