Here's a test, apply both a glueless and traditional patch+vulcanizing fluid to the same tube about 6" apart. Come back the next day and peel them off. Sure, the older patch requires sanding the tube and applying the glue and takes longer, but it's a permanent solution. You'll end up tearing the patch or the tyre on the glue patch. The glueless patch? Comes right off like a sticker.

The glueless patch will get you home, but you should peel it off and replace with a real patch+vulcanizing fluid.