You can’t use the MyQ because the manufacturer, Chamberlain, decided that they had too much liability if third-party systems could operate their garage door system and they no longer allow it. So you need to talk to them about it. (Note that even the systems that say they do work with MyQ, like wink, can only tell you if the garage door is open, they aren’t able to open/close it from their system. For that you have to use the official chamberlain app.)
As far as the Lowe’s Iris garage door controller, that’s exactly the same device as the GoControl, just in a different box. It will work fine with SmartThings, as long as it’s compatible with your garage door. 