For the last few years I've been using the double edged blades. They seem a lot sharper, and are definitely a lot thinner, than the regular single edged blades.
I cut them into two blades with scissors, then fold masking tape over the back side, so they are easy to hold. One rod, and I throw the blade away. Tried sharpening, but never could get the blade as sharp as it was originally.

You'd be surprised how fast you can learn to NOT cut yourself with a double edged razor and how little attention is actually required. I don't pay particular attention, don't tape the off side and don't cut myself. The good part is they are sharper than the single edge blades and still (for now) available at the grocery store. If there is a down side..... when you drop it in your lap you should avoid the urge to slam your thighs together to catch it before it hits the floor!

Pesco Ergo Sum

Double edged blades are more expensive, and do not hold the edge as long as a regular blade, and are probably harder to sharpen because they bend. YOu can also "palm" a single edge blade without worrying about cutting yourself, so that you wrap guide after guide without putting teh blade down, and not being able to find it when you need it. Teh double edge blades are definitely sharper though - they are also lubricated and need to be wiped clean. Honestly, anything you use to cut thread wraps should be cleaned every time you sit down to wrap a rod. WHo knows what your scissors came in contact with sitting in your plastic storage box?