Âs much as I luuuuv X-23 or as I will always remember Scarlet Spider from the comics I read when I was younger... I'll call Superboy the best clone around in comics.
Just the way he was introduced or how much of a clone he is compared to Superman.
 
Hands down, Conor!

Torrent, the daughter f Storm and Wolverine

I LOL'd @ "F the clones."

I don't normally comment but I can’t help but feel you all forgot about what I believe to be the oldest clone in comics Judge Joseph Dredd, in fact there are aload of clones like his brother  Rico Dredd and Judge Kraken and the clones of Dredd such as Judge Rico (the other one)    

Fix

X-23, Namorita, Stryfe and all the Marauders.

Superboy: he came a long way since his "don't call me superboy"-days, he really stepped up from just being a clone

Laura Kinney, Conner Kent. Out of those two Laura wins. Other than these two characters clones suck. There just a lazy device for writers to explain away deaths or ride the coattails of a popular character. 

BIZARRO !!! who more? Somebody forget him in this list, and I can't understand. He's one of the first clones in comics.

Defeated Darth Vader in a fight, and survived the Sarlaac twice. Definately the best clone.

" @WW-Fan:  Love the picture of Donna Troy!!! Trully beautiful!   And if Donna Troy is acceptable as a clone of choice - count me in...   And Power Girl but I don't know if 'clone' is the right term for PG and Donna... "

I have to say Superboy. 

Ben Reilly is a good of a good character getting screwed over because of a editor. You had what the Editors today want a single unmarried spider-man in Ben Reilly. You could have easily have Peter go off, have a somewhat normal life and only come back when Ben needed him. But the editors failed because they extended a storyline far passed it's ending point.  
 
X-23 and Superboy are both characters though.

X-23

Superboy Is by far the best.