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Yellow has higher level pokemon gyms and color. Sprites are less familiar in R/B but some people prefer them.
There's also some in-game trades that are different, but everything except Jynx (in R/B, not in Y) can be caught somewhere else. There is a Machoke trade in Yellow that evolves.
You don't have to use Pikachu so I don't understand why /vp/ pretends to have a hate boner for the game.