There is multiple Yu-Gi-Oh! games that can be played online the best are Yu-Gi-Oh online 1,2 & 3 they are for PC but cannot be downloaded from steam as of now.
There is an online game for it
No. After Yu-Gi-Oh, there is Yu-Gi-Oh GX and Yu-Gi-Oh 5D. In April, Yu-Gi-Oh ZEXAL will be out.
Yu-Gi-Oh! Questionairre is a UK company for asking Yu-Gi-Oh! Duel Monsters, Yu-Gi-Oh! GX, Yu-Gi-Oh! 5D's,Yu-Gi-Oh! Zexal and Yu-Gi-Oh! Capsule Monsters.
Yu-Gi-Oh Power of Chaos Kaiba the Revenge is a PC game which emulates the Yu-Gi-Oh card game. Objectively, there is no best deck.
you can look on eBay
The Yu-Gi-Oh series before 5Ds, was Yu-Gi-Oh GX.
It most certainly is, Yu-Gi-Oh! fan!
Yu-Gi-Oh Duel Monsters GX: Tag Force Evolution Yu-Gi-Oh! Capsule Monster Coliseum Yu-Gi-Oh! GX: Tag Force Evolution Yu-Gi-Oh! GX: The Beginning of Destiny Yu-Gi-Oh! Shin Duel Monsters II Yu-Gi-Oh! The Duelists of the Roses
You can play Yu-Gi-Oh online on platforms like Dueling Book, Yu-Gi-Oh! Duel Links, and Yu-Gi-Oh! Pro.
I would say Yu-Gi-Oh, as it have been out for longer.
Yu-Gi-Oh GX takes place ten years after the original Yu-Gi-Oh.