For anyone looking for an interesting read, give Dragon Ball Universe
a try. While I see it on the list, I feel it deserves more credit due to its unique story and ability to think outside the small box of Dragon Ball
doujinshis. DBU is a rare case of a DBZ sequal that doesn't try too hard to recycle everything that came before it. Universe
has clear characters with clear motivations, and gives development to characters that lacked it in the main series (such as Goten). The artist also takes liberties with its art that develops its own style, but absolutely nails
the humor aspect of DB. Also, while sometimes the artwork does not resemble Toriyama's style, the fight scenes are absolutely gorgeous.
If your looking for a unique and fun sequel of DBZ that doesn't dip into the usual cliches, I suggest you immediately check this out:
http://slangh.deviantart.com/gallery/26 ... offset=216
Also, the artwork at the beginning has a more rugged look that you don't see in most mangas, but if you don't like it just read on (the artwork gets much better).