As with everything sound related, tone is in the ear of the beholder. I could tell you all day about XYZ caps being the greatest thing on Earth, and yet, you might think they sound cr@p in your guitar. To some people's ears caps make a big difference, to others none at all. Some people prefer the 10 cent ceramics over the $20 hand-rolled foils, and vice-versa. Only you can determine what you like (in your style of playing) by trying different kinds and different values.
Pots are in a similar situation, although because they have mechanical properties, it is easier to determine how they "feel" and how they taper. The top brands, AFAIC, are, Clarostat, CTS, Alpha, and Panasonic. These tend to be better constructed than the cheapies that normally come installed in modern guitars.