Maybe I should not have used the word "favored", as I do not have a preference or recommend one pot over another. From my experience with the SG Special Faded, I like the way those guitars sound with the stock 490 pickups and 300K pots. A 500K pot is not "better" than a 300K pot or vice versa. They are simply pots with different values. If the measured value of a pot falls far below what it should be, then that would explain why it may cause a guitar to sound "muddy", because there is less resistance between the pickup and ground. Traditionally, the rule of thumb in the past was to use 500K pots for humbuckers and 250K pots for single coils. Some modern humbuckers have higher outputs compared to early vintage humbuckers. Using a 500K pot with a modern high output pickup may cause it to sound too shrill, where a 300K pot would be a better choice for that application. Not all humbuckers are the same, so it makes sense to use pots and caps with values that are a good match to the pickups being used. What's a "good" match depends on who you ask.