Pre Built Coils v Rebuildables ?

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What is the main reason for people using rebuildables ?
I like cloud chasing and with my TFV12 using my X4 i can do just that, i was considering getting a rebuildable coil but don't know if i should ?

Are they better for cloud chasing, and is it easy to do?
I've read some people saying you get more clouds, some people saying you get less clouds...
Thanks

Pre Built Coils v Rebuildables ?