If you're concerned about the looks, they're both about equal with SE having a slight edge for not having the ugly antenna stub. Feature-wise, LG clearly wins with UMTS and a higher resolution screen. It's a cointoss, but if data is of any concern I'd pick LG. If you have used EDGE in the past and tried 3G, there won't be turning back
Edit: forgot to add. If you're with Cingular and want data, go with MediaNet unlimited. $20.00 for unlimited wireless broadband is sweet.