There is no comparison to be made, i'm afraid.
They are different devices for different uses.
If you want to compare the CPUs, go ahead. Not even the cheapest laptop will feature a CPU that can be beat by an ARM processor. And that is for a reason: power consumption.
Mobile devices like tablets and phones are designed from the bottom up to last as long as possible and that means the CPUs that go in them have to be very power efficient. And they are, but at the cost of performance.
On the other hand, laptops are built component by component with parts that are not necessarily power efficient, but that can perform at a certain standard. At the end of the assembly they just slap a battery in there and that's that.
Talking about GPUs, I'm not certain how an Intel integrated GPU would fare against a tablet or phone GPU, but any dedicated card should crush the best mobile mobile GPU.
Another aspect that shows the difference is cooling. Tablets and phones use passive cooling while laptops have active cooling (i.e. fans). That means the hardware inside mobile devices has a low temperature cap (so that they don't burn your hand) and laptops are usually sitting at 90°C comfortably
I'll give credit to Apple's tablet lineup; they make great products. However there is no real competition between tablets and laptops