I’m not familiar with either one of those brands. I use Oxbow. Oxbow is sold at Pet Smart as well as several places online. It sounds like you only have Petco in your area. I know that some people here do use Kaytee for their rabbits. Just be sure that you are getting plain pellets, not any with seeds or colored bits added in.
If your rabbits are adults, they should be getting timothy based pellets, not alfalfa based ones.
Here is the recommended nutritional value to look for in pellets:
Fiber 18% minimum (20 -25% best)
Fat 1 – 2% max
Protein 12 – 14% max (long-haired breeds may need higher)
Calcium 1% max
If any of the 3 brands you are considering are plain, timothy based pellets (if your rabbits are adults) and they come close to the recommended nutritional value, they should be okay. I usually get my Oxbow pellets at drsfostersmith.com, where I also get my hay, or I might get them at Pet Smart if they are on sale. I find that Pet Smart has high prices.