As I understand it, you cannot go wrong. I've heard nothing but great things about both, but have never tried a Sugartree. I play with a Tascarella and I love it, but that's not to say I wouldn't love a Sugartree as well. They're both known for excellent construction and playability as well as great aesthetic. There was actually a thread about this maybe a year or so ago where you can get some more opinions:
http://forums.azbilliards.com/showthread.php?t=364238
For me, stylistically, I've always loved the traditional look of a Tasc which is one reason why I lean towards his stuff, but the wrapless merry widows that Eric makes are another favorite look of mine and he certainly has his original touches that are really great too like his micro rings and fantastic choices of woods. Definitely a more modern counterpoint to the Tasc.
A couple things to consider: one is the fact that you'll probably be dealing with either a SS or ivory joint with a Tasc, and the Sugartree will be primarily phenolic or wood-to-wood. Also consider wraps - Eric doesn't make a lot of cues with wraps, so if a wrap is a must the Sugar is probably out. And unless the Sugar has a lot of points or is super fancy, it'll probably be much cheaper than the Tasc.
In short, blah blah blah and they're both really good.