Best online casino for blackjack and slots, please?

I posted a question earlier about free money to play blackjack at an online casino. I really like the slots too. Where's the best place for both? The other day I found a casino with different bonuses depending on the type of game that you play. I can't remember which casino it was, but why would online casinos have different bonuses depending on the type of game you like to play? Doesn't make much sense to me.