I have chosen a project that lends itself well to both. I recommend using the XXXX viewer. It is approximately XXXX KB and takes approximately XXXX to download on a 56K modem. Once the viewer is downloaded, the VRML file itself should load in about XXXX seconds. Once loaded, you can travel anywhere within the model in real time.
Movement is smooth and quick, even on a fairly slower machine.
Your coordination will probably be the only thing limiting the speed at which you move. It allows the user to study floor plans over the internet. Not only can you open a picture of the plans, but you can zoom in and pan around the plans. If he or she is really, really cool there may even be a link to a VRML model you can explore once you have the lay of the land figured out.