I use floss with a swivel. I found a tiny o-ring (-003) that works on the 8/0 2004el hook and #7 swivel. the oring keeps the hook from coming out of the swivel and it is easier to put the hook on. As for the extra stitch in the body, I find 1 extra stitch is enough to help with the sancocho's on the 1st bite. Fishing in the Pacific the fish are more aggressive on the bite and will come back 4 even 5 times and having the extra stitch in the body helps keep the bait in one piece so the fish will come back when you have a bad angler. I have had the wire rig pull thru the bait and have the hook end up 6 to 8 inches in front of the bait after the 1st bite and you can't hook the fish when he comes back for the second.
I also use the swivel and floss for larger baits, Mackerel and Bonita with a larger swivel and hook. I rig the swivel in the mouth of the bait and they will swim w/lead or flop w/o lead.
As for rigging time, once you get use to the floss it is about the same. anyone rigging 50-70baits a day regularly gets any rig down to about 30-45 seconds a bait. As for preparing the floss or wire most people have an off season and I Will have 2000 rigs made as well as hook leaders. There is no reason you can't make the rigs 6 months in advance.
Let's all keep inventing new rigs as the perfect one has not been thought up yet.
I like long, heavy gauge copper wire. Been rigging with it basically the same way since 2003 in Costa Rica. The baits swim and are easily changed. With the long wire you have enough to make a "double wire Loop" that won't break and you can also "lock" the loop and add extra wraps in front of the loop so the copper doesn't spring foreward on a missed fish. Also for me it is very easy to rig.
I have fished with some who use floss and needles and spend forever rigging only to have an ugly looking bait where the hook doesn't stay put. The barbs also have a tendency to snag when removing the hook on a bait change, slowing down the process.
That being said, there are other crews whom I respect and hold in high regards who use either copper or monel with swivels or use floss whose baits swim excellent. It is their preference as using the copper is mine.
My take is to find out which way you can rig quickly which also swims pretty. An other important factor is to make sure the bait can be pulled on hard and not change how the hook rides. That gives you the oppertunity to get another crack or 6 at the fish if you miss it on the first try and he doesn't leave just the head. There is no "right" or "only" way.