The Iris/GoControl Device is on the official compatibility list, so you can get help from SmartThings support if you need it and it does work out of the box as long is you have one of the officially compatible physical garage door controllers.
https://www.smartthings.com/products/-/filter/categories/other
MyQ is not on the official compatibility list and the unofficial integration has been shut down at least once from chamberlain’s side because it violated their terms of service. So if you are looking at forum postings, make sure they are dated 2018 or later as a lot has changed over time.
If you are paying for the MyQ IFTTT Service you can get some integration that way, but the last time I looked it only allowed you to close the door from SmartThings, not open it.
If you want to use custom code, you can get more functionality, but again it’s not officially supported and set up is much more complex than for the iris/gocontrol device. See The following thread for the most popular current option: