Your Grandpa was almost right. I have, actually, heard some pretty dumb questions. Yours, however, is not in that category. It’s a matter of personal preference. Wax is kind of traditional, but I’ve had trouble in the past with cracking. If the wax cracks, mold can form under the wax and ruin at least part of your cheese. It requires regular inspections and remediation as necessary. Bandaging, or patching as you called it, is even more traditional. This is how cheese was aged before wax came available. It, too, requires regular inspections, and additional applications of lard, or whatever grease you use to coat the bandage. And a rather thick layer of mold will develop on the surface, which is ugly, but should come off with the bandage when you open the wheel. A third option, and the one that I have personally gone to, is vacuum sealing. I have had less difficulty with this method than with the other two, but occasionally a seal goes bad and it must be opened and re-sealed.
So, each system has it’s drawbacks, and it’s really up to you as to what fits your personality and lifestyle the best.
Another decision you’ll face is this: how long will you age your cheese? If you use raw milk, which is the best, you will need to age for a minimum of 60 days. But with cheddar, you’ll want to age longer than that to get a fuller flavor. Probably 4 months would be good for a mild cheddar, 6 months for medium, and longer for sharp. Some have aged for as long as 2 years - but their patience exceeds mine.
So, onward and upward!