As a transformer prime owner I say go for the iPad unless you absolutely have to have android or really hate itunes
Agreed, I've owned a Asus Eee Pad Transformer Prime now for near on a week and I'm not entirely happy with my purchase.
Firstly the Prime struggles to render some web pages that my Galaxy Nexus eats for breakfast and this isn't down to screen resolution as the GPU in the Prime is far more powerful and resolution isn't too different. My browsing experience on this thing pretty much consists of constantly clicking the "Ok" button on the "Browser isn't responding" message.
Also when applications are written to the /data partition from the Google Play store, the device comepletely locks up. This again doesn't happen on my Galaxy Nexus when installing the exact same application but it used to happen on my HTC Desire; it really shouldn't happen on the Prime given the specs.
Then there's a complete lack of tablet applications on Android. Take for example the Sky Sports applications on iOS vs Android, the iOS tablet application which my housemate has on the new iPad2 is excellent; on Android it's just a stretched out mobile view and doesn't even rotate.....
I'm so underwhelmed by my experience that I'm considering moving completely away from Android when it comes to contract renewals. Getting hold of this Prime was trying to get hold of stardust, unlike my housemate who waltzed into the purple shirt store a week after launch of the iPad and snapped one up....
Unfortunately I don't see the quality of Android tablet applications ever reaching the quality of iOS counterparts. You can read it on pro-Android blogs that developers struggle to make 25% of the revenue that their apps on iOS do, from Android. I'm not sure why this is as Android's market share has become so strong but I suspect it's down to a lot of Android users just not wanting to buy content.
Another gripe with my Prime is the blatant lack of testing this device has been given. Due to the form factor, typing on this thing in portrait mode is impossible with the software keyboard; to the point I actually get shooting pains in my wrist by the time I've written simple paragraph. I installed thumb keyboard off the Google Play Store which helped a lot but it wasn't perfect as I had to reduce the height and width of the keys with the Ice Cream Sandwich theme but that made the numeric key pad mode completely squashed up.
Was playing with the iPad in a large Tesco store the other day with a colleague who owns one and he showed me a cool thing with the on screen keyboard. He simply slid his thumbs from the centre of the keyboard to the edge of the screen and the keyboard split in half, replicating thumb keyboard. I give it to Apple, their products have been designed to be as ergonomic from every angle before shipping, unlike the Asus which has blatantly had little testing.