I detest the long-tailed cast on for personal reasons (full disclosure and all that, you know). I use it only
when absolutely required
to do so, e.g., for a class where the knitted product will be inspected.
If you plan to make several dishcloths, maybe each one can use a different cast-on, so that you learn multiple cast-ons?
There are dozens, scores, perhaps hundreds of cast-ons in the world (at least according to Cap Sease's book
), so learning as many as possible and the circumstances under which they're advised might be an additional secondary goal of knitting the dishcloth(s).