Pex tubing/Shark Bite copper fittings
I have not tried it yet, but I am thinking that for remodel work, Pex tubing and Shark Bite copper fittings are probably the fastest most efficient way to go.
The biggest hassle for me when plumbing in new lines is when I have to go under the house and cut a water line and it ends up being the low point in the system. Water just continues to drip, making a solder joint impossible until I dry out the line.
The Shark Bite fittings do away with having to deal with the proprietary Pex crimping tools.