Many people wonder which brand of potatoes to use when preparing their mashed recipes, and it's a valid question giving the daunting selection on the market. It's hard to go wrong but search for higher quality like russet that is reliable and avoid lower-priced brands. There is absolutely nothing wrong with combining high-quality brands together to create your own unique blend. In fact, this can be an opportunity to experiment and find out what's best for this recipe. This particular recipe calls for baking potatoes so make sure to distinguish that type so they are mashed easier as they are grown for this purpose. Sometimes there are different hues in mashed potatoes and exploring this can also add to the aesthetic of the final dish. You can effectively alter it to the yellowish side if you desire and test out different combinations. Examining the final consistency and taking notes is the best way to mix potatoes, but always use the same amount and prepare them quartered as the recipe calls for.