A better way to phrase this question is what is the most comfortable type of carpet?
Comfort is being able to take a nap on your carpet because it’s as comfortable as your bed and isn’t itchy. The feel of carpet depends on the style of the carpet and the fibre it is made from.
The softest and most comfortable style is plush piles and the softest fibre is wool. Combine the 2 and it’s a match made in heaven, however is arguably the most expensive choice.