In short, open source CMS's are more difficult to use, carry higher long term costs, come with limited warranties, are more difficult to support, more susceptible to hacking, lack development control and can't guarantee being tailored to your exact needs without causing breakages from system updates. When it comes to vettting the product, you don't really know who's behind the software, its modules and whether they'll be supported in the future.
We guarantee the exact opposite, with cost savings, total ease of use, upgrades always (without you having to get involved), a lifetime CMS warranty, best in support and knowledge that whatever you need developed for your website can be built and with ease. Plus we take 100% responsibility.
90% of Webtrade's new customers move to us having used an previous open source CMS but preferred how much easier Siternity CMS is to use and our approach to reliability and aftercare.
Open source website content management systems like Wordpress, Joomla and Drupal, by their nature are hugely technical and difficult to use - fine for a web developer, but awkward for the normal non-technical owner of a website.
For some it's a philosophy question - Microsoft Windows v's open source Linux? Microsoft Word v's Open Office package? Apple iOS v's Andriod? For most though, the key is using companies like Apple, Microsoft and Webtrade who believe in making slick products, simple to use, reliable and functionally excellent is key.