I've heard many good things about both. Although it's a bit more costly, i'm leaning towards the Meatball. It looks funkier.
You are comparing hyundai's and BMW's.... Both will get you from A to B but the ride on the Meatball is going to be a whole lot more fun. I used to think my 'Tron+ was it untill I tried an original. Night and day. Now this filter here.... http://www.chunk.com.au/a00f.htm Is like a mini-Meatball and works wonderfully. I also know where you can get one for cheap.....
Cool to see that people have heard of the meatball. They are awesome, but expensive. Ed from Radiohead is where I heard of it, he uses it to make record scratching noises and such (sortof). For those of you who care, and don't know he is a guitar player.