Very good question!!!
Pros: Certainly less expensive. All pre-framed material is cut at very precise measurements. Weathering is not an 'issue' (so to speak.)
Cons: Probably limited in 'custom' requests, and perhaps VERY expensive for 'subtle' changes. Very low threshold for 'intollerances' where the pieces 'meet'.
I can't think of anything else but I'm sure there are others, either way. Do you have a specific concern???
My best to ya and hope this helps.
Jay J -Moderator
PS: Start searching around at Prefabricated Homes WEB Links for info ...