Polls are always funny. Everyone has the opportunity to vote, and yet, when the results are shown, no one is satisfied.
It reminds me the annual "25 best shmups ever" poolin the shmups.com forum. Every user can vote in this poll (You actually has to make a list of your favourite shmups of all time). It has been done twice,, and both years the winner was the same game (Dodonpachi ,for who wants to know). And then in both years there were dozens and dozens of people complaining about the results
I vote for Elite. It's the best game in this list for sure. IK+ is lots of fun too.