Without a doubt, I would definitely say: iPad !!!
I've played TL games on iOS devices, like iPod Touch, iPhone, iPad and android devices like tablets and Kindle. I have to say how gamplay is much speedier, better, faster on iOS devices compared to android/kindle. In fact, Kindle was the slowest operating system/device that I've played on. And that was a new Kindle, with almost nothing on it at all, just 3 TL games. It ran so slow that I eventually couldn't play it anymore and gave up on it. Same was for me with a brand new, out of the box, top of the line specs and a large memory capacity of an android tablet with nothing else installed on except TL games. It runs slow and for some reason, it just keeps running slower and slower, to where I can't play it anymore. Eventually I'll probably reset it again and delete all TL games off of it, because they slow down my device like crazy. I think that maybe since all these games were originally designed for iOS systems to begin with, then maybe they aren't coded to work well with anything but iOS. It's just not the same.