I only build face frame but I'll give you a few thoughts. A lot of this I think has to do with area that you are in. Years ago here, custom builders built face frame cabinets and if you went to a hardware store and bought off the shelf cabinets they were frameless with raw particle board interiors and it was known as junk. Matter of fact there used to be a particle board factory here when I was a kid called "Tenn Flake". I'd like to have a dollar for every time I've had an older client tell me that they didn't want any Tenn Flake in their cabinets.
You'll probably not get a helpful answer to which is the best style, it's been a debate for years. Probably best for you to decide what is going to sell in you area. If you're wanting to more commercial then go frameless, contemporary residential, then go frameless. However, in my area, rustic, distressed, sand through, shaker, mission, Victorian, antique, etc, is what sells around here. For that then face frame is the way to go. As far as cost and labor goes, I can see face frame costing more labor but I'm not sure I agree about the material cost. Assuming the doors are the same on either style, you're going to have the hardwood cost of the face frame, but with frameless you're going to be using all 3/4" sheet goods where I'm using 1/2" for the carcass and 3/4" for the shelves. It would seem to me that the extra cost of the 3/4 ply would offset the extra cost of the face frame.