We no longer pin the accepted answer (with the green checkmark) to the top of the list of answers. By default, we now sort strictly by votes (descending order by highest score), and the accepted answer's order in the list is based on its score.
There is a question now on Meta Stack Exchange if we would like to have the accepted answer unpinned on our site:
We can change the way the engine sorts answers in site settings. We would like to hear from you all if it is something you want to see on your site. [...] We are going to collect feedback before the end of September 19th.
I am posting this question here to discuss what would work best for is here at Gardening Stack Exchange.
Just a few numbers for you:
Out of the 16k questions on the site, we currently have 431 posts (so well under 3%) where the accepted answer has fewer votes than the highest answer. In the majority of all these cases, the difference is one or two votes.
The posts with the highest difference are: