Here's my analysis of these five decks.

1) Yami Yugi: not enough good 4* or lower monsters and too many spells that need special requirements. Has some good traps.

2) Kaiba: Not enough good spells, and Blue-eyes has limited potential. Probably still the best chance out of the five because of good effect monsters.

3)Joey Wheeler: Not enough good monsters available in English. Requires too much luck and not enough skill.

4) Marik: 4* monsters just don't cut it. Traps and Tribute monsters are good.

5) Pegasus: might as well just call it a Toon deck and leave it at that.

Definitely Kaiba. In a traditional Tournament, kaiba would probably get out his BEWD s fast. (and in my personal opinion, thrown in a delta attacker for an easy win)

Kaiba would do well. Post one about Advanced tournaments. I'd vote for Yugi in that one.