I don't think there's a device out there that is genuinely good at all these things.
Apps - iPad every time!
Movies - On the go - fairly cheap Android - I hook mine up to a large-ish telly and play through that occasionally, so iPad.
Email/Internet - either - does exactly the same with just...
I have an iPad and an Archos 7Ob.
I took out a second mortgage for the iPad (original v1), while the Archos cost less than £100.
The difference is obvious and you get what you pay for. But I wanted something smaller and lighter for watching stuff on the train commuting to/from work. The...