For the sites that you mentioned, there web builder tools are very limited (just like any other web site builder tool out there). If you are able to create your own web sites you are better off going with a provider that will give you the tools you need for various reasons.
Also, with the web site builders your site will look the same as any other site within the program that is using the same template except for the logo, colors, images and content.
Looking at WIX one huge disadvantage is there lowest priced plan actually has WIX ads. This is something I do not understand as you are basically paying them to advertise on your site with the lowest plan....
Some benefits of the other hosts not within the market of selling you on the web site builder tools are the following.
- Flexibility to install scripts such as WordPress, XenForo, SMF, etc....
- Able to develop your own websites/scripts
- Access to creating your own databases
- easily managed email accounts
- most hosts provide access to cPanel the leader in the hosting industry to manage your hosting account.
- You will most likely receive higher resources and pay less as the web host does not have the overhead to maintain & develop such complex web site builder the companies you mentioned rely on.
- You are able to backup your website and take it to another host easily. Some providers with such web site builders do not allow it.
- FREEDOM AND FULL CONTROL of the space your purchased as long as it is within the TOS/LAW of the hosting company of course.
- etc....