design desktop project question

I am desiging a new project with VS2005. It is basically desktop project and mostly works for accessing database. My boss perfers it could be internet access from remote also.

My questions:

1) should I use distrubute application design

2) need use web service How about performance if use it

3) Should I use web application design ( use ASP.net..)

Generally speaking, web application is slower than windows to access database

how slow compare (sorry I never design web application before).

Thanks.