Four-by-four inch Intel NUC boards come with a soldered-on processor.
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Pro On paper the J5005 maxes out at 8gb DDR4 RAM however it can accommodate at lease double that
You can have 16GB GSkill DDR4 Memory + 500gb SSD and 10TB external HDD. Go with the kit so you can be assured that it runs Linux and only Linux (or whatever your preference) out of the box and isn't subjected to any unnecessary use/abuse at the hand of Doors.
Pro Has at least one SATA port
Pro DRAM is not soldered
DRAM modules are not soldered to the board so they can be changed, upgraded or replaced.
Can run all IBM-PC compatible software.
Con Cost as much as other Barebones
Price is almost the same as a full Intel/Zotac barebone, which can also be dismantled.
Con No GPIO
So it is not really useful for DIY projects.
Con No DRAM included
DRAM modules must be bought separately.