Of all of these polls, Strikers are easily the most difficult to pin down as Best.
I personally consider Archer Ranger to be the Best as it combines high damage with insane mobility and evasion. It is also an easy class to pick up for first time gamers. These things make it superior to other options, but by no means make it the most fun.
I would say most fun is easily the Fey Warlock as it is constantly jumping around and essentially toying with its enemies. The damage isn't quite there though when compared to other strikers. If you define best as the most fun, it would be this.
The Wild Magic Sorc also belongs in the top for fun given the random elements to the character. Unpredictability makes for a fun character as well.
Rogues require the most tactics/skill to play of the strikers. If you use this a measure of the best, than Rogues deserve consideration. I like the challenge that playing a rogue brings along with the payoff that is quite likely the most damage of any striker when it works.
I've never seen the other strikers played yet, but on paper the Rageblood with Swift Charge Barbarian seems very fun to play as well. I wish I didn't always have to DM