Let's look at some real examples from PSE. (Note: Potential spoilers ahead!)
Ghotiy spelling (score of accepted answer currently +39, top answer +173)
This is our most "extreme" example at the moment in terms of score difference between accepted and top answer. Here the top answer reads more like a "joke" answer, as the same method would work on practically any string of characters and not just the one in the question. (Although I'm not sure whether it was meant as such; it was posted some time before the accepted answer, in any case.) In this instance I think I like seeing the accepted answer first, and the other tries after that.
Make 11 from five identical digits (accepted -2, top +34)
Why this answer is accepted is completely puzzling to me since it does not fully answer the question, covering only four cases out of the 10 in the question. In this case I would definitely like to see the top answer first. Although even if the top answer was shown first it would still just feel wrong to see tickmark on the currently accepted answer. Best of all would be to change the checkmark, but of course that's up to the OP to do as they please.
Simple geometry. Or is it? (accepted +17, top +76)
Here the top answer expands on the accepted answer by adding an intuitive visual explanation. It works much better after having read the accepted answer first, so I think here the current order works quite well.
Separate the milk! (accepted +50, top +103)
Here the accepted answer immediately seems like the "correct" one, whereas the top answer is very clever but clearly not what anyone would actually do to solve the problem in the question. Again, makes sense to put the accepted answer first in this case.
Folding paper into corners (accepted +6, +49)
Here the accepted answer simply manages to get a better result than the top answer. The only reason that I can see why it scores so much lower is because it was posted long after the top answer. Absolutely makes sense to show the accepted answer first in this case.
All in all, after looking at several real examples, I think it makes the most sense to do as we're doing now and keep having the accepted answer at the top.