I would choose the .22 Hornet. I do have a .22WMR (Ruger Single Six), and a Contender .22 Horent and a Ruger No.3 .22 Hornet. So, I have a little experience with both rounds.
I would chose the .22 Hornet, though not for hogs, I wouldn't choose ANY .22cal for hogs, if there were other options.
I would choose the .22 Hornet because I reload the .22 Hornet. By tailoring my loads, I can create any level of power from a .22 Short up through the full power Hornet. I can duplicate .22LR or .22WMR by downloading the Hornet.
Yes, Hornet ammo is pricey, it's a niche round, but unlike rimfires, you can reload it. And as a reloader, I have a much larger choice of bullets than just what is loaded in factory ammunition.
Hornet brass is thin, and extra care needs to be taken reloading it, or you will damage it. And in my experience, even being very careful, you will still have some cases damaged beyond use (in the beginning, at least
), but only a few, unlike the WMR where the only thing ALL the fired cases are good for is scrap metal value.
If both do the job you need, and the main factor is the purchase price of factory ammunition, then cheaper makes the most sense. If you reload, then many other factors come into play.