I would go with the Aera 510 (I have a 500 in the UK) in preference to any tablet based solution. I have yet to find a tablet which feels as well engineered and as robust as the dedicated aviation units.
The robustness of the software is another concern, all of the tablet and phone OS's insist upon updating themselves, at the least convenient moment, with various degrees of success.
Would you want to rely on any of them?
Rans6.........