Speaking of Raichu.. Quick Late Valentine's Day Pun (should've done it yesterday, but that's ok) -I should've Raichu A Love Song! Get it? Raichu- write you.. ;-; Yea.
But, with Raichu, the power loss is noticeable, as Pikachu @ Light Ball is very strong offensively, mind you. But Raichu can have more freedom with Choice Items, or Life Orb, etc. It really just depends on what you want your electric type to accomplish.