[1.12.2] Pro / Cons for Structures vs Manually Generated?

Hello, 

My mod is basically a sort of update of a mod I created back in 1.4.7 and it had a lot of structures generated back then and it was obviously all done in worldgen files and code, however, as i'm getting into the process of updating them in the newer versions of minecraft, there is the structure files system(not dabbled much, which is why im here gathering info),but  is there any pros/cons people would point out over the differences between each option? because once my code for a structure is updated, technically all I need to do is generate / replicate it once and create a structure file but i'm curious if doing so has drawbacks, one thing in particular is, how do you spawn entities in structure files or is it possible? because some of my builds require me to spawn special mobs inside them at particular points.

One major point I can think off, is a structure file is much each to rotate into different directions? compared to hardcoded in a worldgen file?

oooooh just thought of another question, how is structure generation handled in 1.13? as obviously I don't plan to stay in 1.12 forever, so thinking of the future, what would you say are the best ways forward?

Sort of a mod discussion / help for me to decide where to go!

Edited April 26, 20196 yr by Zathrox