it seems that if a web surfer enters a keyword and he finds your site on #1 and my site on#2 he or she will definitely read the description of almost top 4 sites(in most cases) specialy in google i found that if you luckely get your site against a keyword on #1 but sites on that organic page under your,s got more traffic bcoz of there discription . the surfer found what he is lookin for in the #2 site and fetch the traffic from #1
We can't predict where a user will click but #1 definitely is going to be clicked more often than any other number.