Whichever way you go, make sure you keep a note of where you go (sites), if using your own vehicle to get there and keep any receipts for purchases you make.
PAYE offers some security, although with the way things are, not like it used to.
CIS gives more flexibility, providing you can find the starts.
It really is a personal choice but depends on what is on offer. No reason why you can't do both either, if the work is there.