Truss roofs have a lot of benefits going for them. They are manufactured and dropped on site for installation. They can span great distances as well as having many different configurations; from a low pitch to extreme pitches as well as having vaulted ceilings barrel ceilings or stepped and pan ceiling all these can be incorporated into a truss.
Trusses give you a basic frame work to build from Trusses in and of them selves are great for a track house slap them up and install the roof sheathing than your off to the next job site.
On a custom home trusses are like a beams we use for a bridge it in no way follows the finished shape of roof structure.
Example if you want a pan, barrel or even a vaulted ceiling a lot extra framing must be done to get the finished look.
As is true on the exterior, they don’t make dormers in trusses or any type of valley all these types of decorations are all hand framed above the trusses.
The draw back with trusses they don’t give you a perfectly flat surface to install your roof sheathing or sheetrock onto. The most trusses very 1/4”-3/8” while I’ve had some come out that were off by 3/4”.
Now what can we do by code we can not cut them so we have to strip the rest of the trusses up to the height of the highest truss. A lot of extra time because some one was lazy at the truss plant.
The truss plants say there is no deflection in there trusses.
But I’ve seen on a 26’ girder truss holding up a hip set, have a deflection of 1/360 or over 3/4” pushing the interior wall down that had no load bearing below them cracking the sheetrock and racking the interior doors to the point I had to cut the top of the door so it would close.
The nice thing about hand framing you have flat surfaces to work with you can modify and rafter, or roof jack as you go.
The down side you are limited in span as to thickness of the lumber that’s being used.