Neither, Obelisk can gain infinite power for one turn by sacrificing two monsters and Slifer, if you have the infinite hand card on the field, will eventually have over 100,000 ATK but it could kill Obelisk on it's first turn when it's out if you have 5 cards in your hand.
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obelisk
if you sacrifice ra and slifer while obelisk is on the field obelisk wood have infinite attack and nothing can stop him
The card you are thinking. The fusion between "Slifer the Sky Dragon", "Winged Dragon of Ra", and "Obelisk the Tormentor" is called "The Creator of light, Horakhty".
you can't become an obelisk blue in this game. you have to finish it as a slifer.
get a better card like obelisk the tormentor i have 10