Didn't anyone play Crystal first? Guess, I'm the only one. :/ Anyway, i don't think i'm going to buy any of these games. But i'm sure, it's going to be awesum.:D
You can (maybe? most likely) get both legendary birdies in HG/SS. It was possible in G/S that no matter which version you chose, you could get both Ho-Oh and Lugia in the games. The one that was opposite of the game color would be found in it's location at a higher level than the birdie that matched the game color.I want to buy Silver because Lugia is my favorite Legendary, but I don't own a Ho-oh and would like to own a game where I have the ability to catch one. I have Gale of Darkness so I have the ability to get more Lugias, but I suck at Colosseum (because I'm used to Gale of Darkness gameplay ;-; ) so I'm nowhere near catching my Ho-oh in that one. So, I'm probably going to go with Gold.
My first pokemon game was gold, and I luved it, so I'm getting Heart Gold, plus gold has Flaaffy, my favorite pokemon. But, if Soul Silver has better sprites than gold, again, I'll consider getting them both :)