Voted for dPoll (https://dpoll.xyz/).
I just opened stemq from the link you provided, I never knew about it and I can't comment on it.
I think all the others except dpoll have are receiving massive support from various communities and are doing very well in terms of supporting their users.
dpoll at the moment needs this magnitude of support. Also, their current SP is not much compare to the others mentioned and your support will go a long way to encourage dpollers to create interesting polls.
I read a recent notice involving Share2Steem and I guess it might interest you;