Majorascraft HD because the textures look nice and the amount of fame it has is astounding, over 175,000 downloads on pmc (at least the regular one, the HD one has about 70,000)
I almost always use default, but the only other one that a use (at least more than a day or two in my entire life) is Dokucraft, in my opinion the best texture there is.
I use faithful 64x64 because it stays true to the original look (when it doesn't the textures get annoying) while still improving the looks
I use the ZeldaCraft Official Pack made by EyelessTenshi https://www.planetminecraft.com/texture-pack/zeldacraft-official/