I intend to use PEX tubing to do the plumbing in my 19 fixture home. This is for the obvious reasons of cost and labor. My friend and I will be doing the work.
I heard about 2 options for running the PEX.
1) A manifold system with each line being direct to the fixture.
2) A conventional "copper" system with a couple "main trunks" going through the house and branching off for the different fixtures.
I don't know any cons to either but it does seem that the "conventional" way would be the easiest and least expensive.