Bouv, try catching the episode of Good Eats where he explains what’s the best to use. It was the second ep in season 1 so it may not be all that easy.
But it comes down to taste choice I guess.
Waxy will give you a more smooth texture and floury gives you a fluffy texture !
Moving this from IMHO to Cafe Society.
A friend of mine whi is a student at culinary school was taught to boil red potatoes whole until they would not quite slide off a fork, then bake them for several minutes to dry off any excess moisture. Mash with some but not all of the skins on, add cream, butter, roasted, garlic, whatever you want. Yum.