GET or POST to Query or QueryService?

Is there information on exactly how we should be accessing IQA's now? We were using the IQA endpoint but that is moving to the QueryService. I was POSTing to it's _execute handler but then saw that you've added the ability to make a GET call again.

I was able to Get /api/Query?QueryName=... and pass in the limit and offset, etc. but then I wasn't able to pass in a parameter at that point.

We are on 20.3.90.44742 and would like to make sure we're using the most future-proof calls as we develop a new website.