With no page limit and 500 MB of space, you'll likely have more than enough space to build your site, and it even provides HTTPS/SSL encryption, meaning your visitor's information will be kept safe. Plus, you're able to integrate your site seamlessly with social media accounts. If you do decide to use Jimdo, beware of one thing: the builder prevents free websites from being indexed by search engines.
Gator Website Builder has more than 200 templates that are professionally designed and available for free. And yes, all of them are mobile design compatible. You don't need to do anything to activate the mobile design. Gator does allow you to edit the content in your mobile version without affecting the desktop version. Editing content on the mobile version can be handy if you have special mobile-only sales or if you want to optimize the experience people have on their phone.