SiteGround is the wisest choice for Shared, WordPress, or Cloud hosting when compared to Bluehost. While Bluehost offers low initial and renewal rates, SiteGround's performance (speed), reliability (uptime) and support is far superior.
The uptime is reported to be the same for both hosts ( hovering around 100%). However, WP engine has faster page loading speeds.
Price wise, if you take advantage of annual payment discounts, SiteGround’s GoGeek plan works out a lot cheaper than WP Engine.
On SiteGround’s GoGeek plan you can host multiple websites on different domains. Whereas the WP Engine Personal plan is just for one WordPress website plus a staging site.
WP Engine does offer a more straightforward user experience, than SiteGround.
Although SiteGround’s GoGeek plan’s annual payment discount is a great saving. If you value performance, simplicity, and want to use a service with one focus, then WP Engine's Personal plan is the better option. If you want telephone support and have multiple websites then SiteGround is the best option for you.
SiteGround out performs Hostgator in many areas. Their speed is 1.5x faster than HostGator, they're more reliable and have better features.
Both hosts have great support and are easy to use.
HostGator is slightly cheaper with better renewal rates.
SiteGround's overall reliability and performance make them the perfect choice over HostGator.