I just spent about 24 hours installing, learning and testing Digital Performer for Windows--again (I did the same thing about 18 months ago, when it first came out for Windows).
I think DP's ergonomics are wonderful, the notation editor is better in these respects: It can display tied and dotted triplets correctly (I originally thought that dotted triplets were a problem, but apparently now they are not) and also 64th notes correctly (which I use almost never). That's about it. I actually like Sonar's method of having a continuous staff running along the length of the monitor rather than try to emulate a letter- or legal-size manuscript paper, as DP does. It is much easier to resize staves in Sonar, DP wastes a lot of precious screen real estate, at least in terms of notation.
I would simply use both programs but here's the insurmountable problem with DP: It drops MIDI notes and notes hang. It only happens when I am sending midi data from the DAW to my 2nd (dedicated to VSL library) computer, using two MOTU MIDI interfaces, the Express XT (8x) and the Microlite (5x5). I never experience dropped or hanging notes in Sonar, in all the 22 years I've been with Cakewalk, I can count maybe two times that I experience dropped, or hanging notes. DP doesn't have a MIDI buffer setting as Sonar does, which might fix the problem.
DP's tech support is great, really helpful people, but I cannot use a program that impacts MIDI playback. Having a few display bugs in the staff view is acceptable (although I wish Cakewalk would do something about it) but dropped notes are not acceptable. If there were something wrong with the 2nd midi interface, I would think that Sonar would have a problem with dropped notes, but it doesn't. Strange thing is, both MIDI interfaces are made by MOTU, as is my audio interface.
So, I'll probably be using Sonar exclusively for the future. If they improve the staff view CW will have the most stable, feature-rich, reliable DAW on the market, as much for producers, engineers and beat-makers as for composers, songwriters, arrangers, film composers--anyone and everyone who knows the value of notation in music creation.
Jerry
www.jerrygerber.com