As an avid PC user and developer, it'd be easy for me to be biased towards more the more customisable hardware/software that Android/Windows tablets offer, but I honestly prefer Apple devices for my mobile needs. I currently use an iPhone 4S. I bought my Dad an iPad 2 for GarageBand (and general ease of use since he hates his laptop lol.) I find Apple's devices are feature rich enough to be useful in day to day tasks but also simple and consistent.
As for tablets, why would I buy an ASUS Transformer or Samsung when I already have a light weight laptop with a 13" 1920x1080 screen/Windows 7/256GB RAID SSD (Sony VAIO Z)? Why would I want to step down to a dinky 1280x800 resolution screen? That's laughable. I don't need some backwards, virus-ridden, wannabe AppStore that is the Android market place. The new iPad appeals to me because of the screen resolution. I will say the new iPad is a little disappointing in other ways: should have been a quad-core all the way, slightly more RAM, and bigger storage options but it's still the better device.
For me at least, the new iPad wins this round. It offers what other tablet makers just can't beat yet: consistent and simple interfaces, unified hardware (much better for app developers), very strong application market place, incredible screen resolution, decent battery life, and pleasing aesthetics. The other tablets offer nothing that my VAIO doesn't already provide.
As a die-hard PC user, as much as I'd love to jump on the Apple bashing-bandwagon, I can't. Their mobile devices hit that fine balance of features, usability, and aesthetics that other vendors are still trying to achieve. I hate to like 'em as much as the next guy, but they make a good product.