Need live demos for clients. Should I use multisite?

Hi all,
We are a small web design group that recently switched to wordpress (2 weeks ago, actually). We normally have to demo for 4-6 clients at a time, so I’m looking for an easy and convenient way to do this.

Ideally, we want to setup a live demo on our host for our client (we provide hosting service, too). If the client approves the demo, then we would just point their domain to the host, making the site live. But we learned that it’s not possible to put up a wordpress installation without a domain name.

So we thought we should demo on subdomains or directories on our site. e.g. client1.ourwebdesign.com and client2.ourwebdesign.com. That’s when the multisite option came up.

We want to ask if we should install each site individually, or use a multisite? We have zero experience with multisite so I don’t know if it is suitable for our need.

Thank you all for your help 🙂