you will never be able to say, "this is the best paper" all paper is different and each has a different characteristic that will fit the needs of your client. so the best paper is the one your client likes and is readily available in your area. some like gloss, some like satin, some like matte.
For general use i like lexjet suv in glossy and satin. It is a 10mil paper so it is a bit thicker so it runs nicer and doesn't get wavy on me.