Just my .02 cents' worth:
Since October I've had the Nexus 7, Nexus 10, three Note 10.1's (indecisive/going back and forth), 2 iPad Airs, and 2 iPad retina Mini's.
I'm also a very indecisive person and kept wanting to know what was on the other side, and then missing what I had before, etc.
I have found that my perfect solution is the retina Mini.
Nexus 7 - don't like the elongated, narrow screen.
Nexus 10 - great tablet, but PDF annotation isn't there yet on Android.
Note 10.1 - 2014 edition - AWESOME for handwritten notes, but too laggy and again, no perfect PDF annotation app.
iPad Air - too big and cumbersome for my needs (watching in-flight movies on a nearly weekly basis, reading ebooks)
iPad Mini (retina) - almost perfect. I say almost because the S-Pen on the Note 10.1 is hard to forget. But other than that, it's great for movie watching, reading ebooks (like a paperback!), extremely portable but not too small (fits inside my winter coat pocket), the white with brown leather Smart Case looks sharp, very fluid and fast, and just a wonderful device.