BlockTrail is best in OP's list. The only drawback they have is that their page load time is too slow.
(Blocktrail CTO here), Thanks for the feedback!
The Blocktrail Blockexplorer is a so called single-page-app, meaning it loads a whole bunch of javascript into your browser on the first page load and then doesn't really load any full pages anymore when you navigate around but instead only loads the data required to render the page in your browser.
The advantage is that once the page is loaded it's much faster to navigate around, but you're right that the first load is slower than most others!
We've added so many features that there's a lot of javascript loaded by now (for example when you visit a blockexplorer page it also already loads the code required for the wallets dashboard).
We're working on some big things at Blocktrail right now, but soon enough we'll be able to spread out attention again more across all our products and we'll take a stab at reducing the page load time.
It looks like we can easily get it down by half or more if we seperate some of the javascript and don't load it until we need it!
