I usually carry spinners with both trebles and single siwash in case I need to adjust, but in most cases I agree, the trebles hook up much better and dont seem to penetrate as deeply as a single siwash can.

Rarely do I get a gill bleeder with a treble.

The downside is that it does become a bit more troublesome to release fish if you are not keeping it, thats the reason I carry single siwash set ups, for those days when I am releasing most fish I catch, when it comes to keep one for the cooler, I usually put on a treble set up.