I think the Brut is my favourite from Korbel. It's got that champagne fizziness, and it's sweet, but not tooth-achingly so.
It's also fairly cheap and tasty for fizzy wine.
Steam Whistle has a bitterness to it that might take some getting used to. It's light, and has a bit of an earthy taste to it. As I sit here drinking it (after a couple screwdrivers), it's not bad. I can see how it can be refreshing on a hot summer day. I'm still a fan of darker ales, but it isn't bad.
Total damage: free for me thanks to Casey (for sharing the Korbel) and Jess (for sharing the Steam Whistle)! Cheers!