I can safely say Apple takes more care in choosing the panel makers for their screens. Philips on the other hand, have a wider range of choice to meet different budgets. As such, quality differs.
Everything is hackable. You can practically change anything if you can find the driver for it. However, its pretty illegal and takes a bit of work. Fortunately for Apple, to those people that matter, Apple users don't really trust this. To the techies, who are such a minority, the OSX runs faster on DIYed boxes simply because it can be customized with raw brute force components (8 drive RAID-0 anyone?). Apps like PS2 unfortunately, aren't optimized yet.
Apple's screens are nice. But I can always find a matching counterpart in the PC world. It's just harder to find on the retail shelf.