The SE and desktop felt like modern machines, clicks and key presses had predictable results, applications did what you told them too. On par with the Win95 and Win 7/8 I was used to at the time.
Jesus Christ, that iPad on the other hand, feels like janky Windows Vista tech rammed together by an intern. Weird UI artifacts, making the same gesture can have unpredictable results, the only function that everyone in the shop found without failure was 'undo' because it is triggered by violent shaking.
Even simple tasks like sharing a photo saved from a website is bizarrely broken. Depending on whether you saved it as a file or 'to your photos' dictates which applications can then open/share the image. And I know Android is full of it's own foibles but they took a few months to internalize. I'm going on 2 years of 'features' breaking workflow, and pixel perfect taps to activate input elements that are 5% of the screen width.
/rant