Yu-Gi-Oh: Strongest duallant ever?

Yusei. Shooting Quasar Dragon>Egyptian Gods.

Kindly ignore Silbax. Apart from the duel in GX, the main character did not duel each other, which means every word he wrote is a straight-up lie.

As for your question, Yugi defeated the Pharaoh at the end of the original series, so that makes him stronger. Yugi also defeated Jaden at the end of GX. Yusei showed incredible dueling feats during the second half of 5Ds. Yusei's deck is also newer and can combo from out of nowhere.

If you look solely at the manga, then Jaden has the most consistent deck, but overall it goes like this:

Yugi/Atem = Yusei > Jaden.

You'll assume I'm lying but Jaden, Yugi and Yusei are equal in the anime. If Yugi was put up against Yusei than he would win, and Dan Green (Yugi's voice) and whoever the voice of Yusei is actually had a duel as their characters where Yugi won. As for the duel with Jaden there is a deleted scene gallery that 4kids made where Jaden actually did win and Yugi ended up giving him Slifer, (NO JOKE). Thats why when Jaden dueled Yusei, Yubel told Jaden that she sensed a great power in Yusei, and Jaden should consider using "that card," and it is believed that she was telling him to use Slifer, but Jaden ended up refusing and having Divine Neos lose to Shooting Quasar Dragon. So the 3 make a triangle of winning and losing.

Btw not all this is a complete lie just the parts with Jaden vs Yusei. Yugi's voice actor and Yusei's did actually duel at one of the tournaments as their characters and Yugi did win. So take that Butt munchers!

Yami Yugi is the best, I don't care who says otherwise! He has all 3 Egyptian god cards and if you can't get something like that, you can't be the king of games, he is the king of games, the battle city tournament winner, he freaking whipped Marin even when he cheated! That has to show that he has some skill above any kid at high school or some dude who duels and races at the same time!