If you expect any useful answer, you should specify your (intended) use/requirements.
Otherwise all sorts of people will tell you why they think a particular device is great or is not, but whether those reasons apply to you as well is a totally different question.

Compared to what?
Compared to a capacitive touchscreen I prefer a resistive one because of the accuracy. With the stylus I can control my N900 at 1 pixel accuracy. Afaik, that doesn't work with capacitive screens, although I might not be up to date.
Compared to IR screens maybe the preasure sensitivity is an advantage. There is a pretty impressive video on youtube of someone drawing images on his N900. I'm pretty sure this is a niche use, but then again, this whole topic is about a niche.