For the second question, it might seem obvious, but lots of people rather have mods organised as simply as possible, hence I'm asking the question because for example, for me it's either all or no part of a mod, i never use parts of mods. This is for simplicity sakes especially when keeping track of installing/uninstalling, patching mods etc.
If you vote for any of these you don't need to give any reasons, FCOM is popular enough that everybody knows about it, and second question is sorta self explanatory.
Thanks for voting!
edit: actually, if you don't use FCOM, but you use any overhauls or a combination, just not FCOM, then please provide some reason as to why it's better compared to FCOM, and what you prefer instead of the full FCOM setup