Aww, a really hard choice, I love both ! :pink_frown:
Anime, it's my childhood, there is so much nostalgia when I think of it...
And I begun to read the mange recently, it's simply awesome, and more suitable for older fans like me (I mean, as soon as you're about 12-13, anime become a little childish, even if you like it).
But I have to choose the anime. The manga didn't make me love Pokémon, anime did. I was every morning in front of my TV not to miss the daily episode, I almost cry when I got my first Pokémon video tape... Anime is too many memories for me, I can't not to choose it.