1. Joomla is more secure when hosted by SiteGround
SiteGround protects your Joomla on three levels. First, they protect the Joomla itself by adding a unique security plugin to fight hacker's attacks. Second, they isolate each hosting account so that your Joomla install cannot be hacked through another person's vulnerability. Third, they apply server level protection whenever a major security issue with Joomla appears.
Joomla on SiteGround: protected
Joomla elsewhere: vulnerable
2. Joomla is faster when hosted by SiteGround
In comparison tests with 14 more web hosts there is Joomla loads considerably faster on SiteGround servers. This is because SiteGround hosts on powerful and additionally optimized hardware and applies custom software that speed up even more the Joomla performance.
3. Joomla is better supported when hosted by SiteGround
The SiteGround support team provide free assistance with more Joomla related issues than any other host. You can count on them for installs, upgrades, and even advanced security issues resolution. When you add that they are available 24/7 and rely within 15 min on average it sums up to simply the best support you can find!