I'm fairly certain the answer to both of those questions (especially the second one) would be "Intel" :P
I really really wish AMD would just pick a side already. Either go the Nvidia route or the Intel route, just don't half-ass both your Open Source and Closed Source drivers :/
I would like you to show us where Intel HD chipsets outperform AMD APU's with OpenCL, since that's a large deciding factor for many.
I like the APU graphics test but i would rather see an "APU"-battle intel vs amd.
What is the best APU for linux?
What is the best open source APU for linux?
If you are interested in graphics performance than AMD wins, regardless of the state of Intel drivers, both on AMD's closed and open drivers. Power saving and general desktop performance is a different story.
If you want gaming quality APU. Go amd.
If you are concerned about battery life and don't want to play games, go Intel.
Intel's graphics hardware is rather weak compared to AMD/NVIDIA. They do get good battery life though.
Not if you are looking at the Iris Pro.
And when the next-generation Iris Pro comes out along with Broadwell, expect to see that gap shrink even more, or even tip in Intel's favor.
off-topic: How the heck did intel suddenly catch up so quickly in the graphics department still remains a mystery.