I am now using eSteem alot, mainly for comments as there will be votes for my comments.
Chainbb is another one I am using too. Since not all posts on Steemit appear on Chainbb, I have to switch among Steemit, eSteem and Chainbb quite often.
SteemQ, Zappl, and Steepshot are totally new to me, will be good if someone can let me know more about them.
I guess now the question is if all the different apps should show same amount of posts. That should be decided by the developers, based on original purposes of the apps.