Here's a detailed link on setting up a scheme server (perhaps more detailed than many system admins would need). I'd err towards mod_lisp under Apache rather than run SISC Scheme under Tomcat, but this is a pleasant read:
http://www.lisperati.com/quick.html
I can't speak for the GP, but since it has been 11 hours and he haven't answered yet I'll give you my answer: it's mostly a matter of taste, or sometimes if there is a particular library/app/framework for one which you'd like to use.
I would also add that at least in my experience the Scheme community was much friendlier the the Common Lisp one. They don't particularly like novices over there and it is quite easy to get flamed if you're not careful enough...
