So I have some really great Pokemon on HeartGold, and I've had bad experiences about turning on a game one day and finding the data is wiped and all my awesome things are gone. So once I've beaten Black, I transfer my best of the best Pokemon over to Black and set them on the Elite Four there. I discover I think the Black sprites for most of the Pokemon are "average" to "cool" and I liked the HeartGold ones better (and Vaporeon's back to sitting with its tail over its feet, which is just copying its OLDEST SPRITE DESIGN) and I miss having all my Pokemon at my back when I beat the Elite Four. Also Johto > Unova, so in conclusion:

I should not have traded my Pokemon over just yet. I mean its not like HeartGold is old and likely to have its data wiped soon. They can never go back to the version which I realize now that I like better than Black. Curse me!

D':