Which service should I use to make my own website?

[We Theme Weebly]

Of those 3 Weebly is your best bet. Unless you plan to build a social network, in which case go with webs.com.

Benefits of Weebly :
Ad Free - You get an ad free site (except for a tiny tagline at the bottom saying (free site from weebly).
Easy and intuitive - The layout system is easy and intuitive
TIME endorsed - Weebly was named one of TIME’s 50 Best Websites of the year in 2007 (if that means anything to you )
Very customizable - While webs.com has more templates, Weebly is more flexible and allows you to get fancier you can even create your own custom theme and import it directly into weebly.

(warning! tiny, but relevant, ad follows)
To top it off, there's a third party service that will do convert any theme to a Weebly theme - http://wetheme.weebly.com

So to summarize:
Webs.com for social networks
Weebly.com for most other basic websites