I would say, whichever one is polling highest, who has signaled support in any way for the issue. Other things about them don’t matter because they aren’t going to win anyway. In this case a lot of third party votes for a single candidate are probably better than the same number of votes spread across different candidates because it looks more like an organized voting block to politicians looking at the numbers in retrospect, who are the reason to vote at all if you are voting third party, you are trying to communicate via those numbers about how your vote can be obtained or lost.
I would say, whichever one is polling highest, who has signaled support in any way for the issue. Other things about them don’t matter because they aren’t going to win anyway. In this case a lot of third party votes for a single candidate are probably better than the same number of votes spread across different candidates because it looks more like an organized voting block to politicians looking at the numbers in retrospect, who are the reason to vote at all if you are voting third party, you are trying to communicate via those numbers about how your vote can be obtained or lost.