Well, the appeal of toxic herbicides, such as RoundUp or Finale is awfully powerful, especially this time of year. You can also add a putty knife or any other tool that you can scrape weeds out of cracks in the driveway and sidewalk. I can personally attest that the winged weeder and the Hound-Dog work. These hoes work best when soil is moist and may take a little old-fashioned effort. Flamers do an excellent job of weeding along fences, in pavement cracks and in turf.
All types burn propane from refillable tanks.
Most flame weeders on the market are the same ones used by firefighters to set back fires. The flame is about two inches in diameter, which may be too big for most landscapes. More practical is the Spot Singafier. It produces a small, easily controlled flame only about a half-inch in diameter, so is more energy efficient. It isn't necessary to completely burn a weed to kill it.