A little late on this one.
Partial results for Series 6:
1st Stardust Dragon
2nd Chaos Goddess
3rd Emergency Teleport
4th Junk Warrior
5th Infernity Launcher
It’s worth noting that a few hours ago, Chaos Goddess was leading the poll, ahead of Stardust Dragon.
As for Series 5, the final results are:
1st Super Polymerization
2nd Yubel
3rd Rainbow Dragon
4th Trade-In
5th Dark Armed Dragon