I'm a Sonar/PC user so I don't have too much to add. However, that Beat Detection Engine that DP4 has now is pretty darn attractive. Breaks the PT/Beat Detective monopoly.

On the other hand, Beat Quantizer works pretty well too (I've been messing around with the demo and it's pretty cool) so you could always grab that regardless of your software choice.

DP4.6 you can install on all your computers without a dongle, which is cool. However if you get mach Five you will need a dongle. DP4 does come with a fair assortment of plugins but no VI's. I am biased towards DP as I've been using it for years. The only reason I would consider changing to logic would be if I got heavier into film work. The integration with all the apple programs, final cut, soundtrack pro, logic etc is really nice and its bound to get better as time goes by.

there are both very good progs IMO, i personally think that logic is unbeatable in the midi department, so if this is important to you, then... and eh the amount and quality!! of plugs and instruments logic is shipped with is very very nice, too...

The advantage of Logic is that you really don't need anything else

I like both programs, they are both wide and deep apps. To me DP surround features are better. It took me a while to get use to the window navigation. I will have to upgrade to experience the improved virtual instrument handleing, it was an akward multistep process.

If you are using MOTU hardware it has integrated support.

I currently give the nod to Logic Pro for the excellent virtual intruments.

As a compromise I would get both, DP competitive upgrade...$395 (why pay full price?)
http://www.sweetwater.com/store/detail/DigPerfComp/

Logic Express, would give you Apple Loop and Garage band compatibility, Sampler, Basic versions of the Logic synths, best of both worlds.

8)

Both programs are going to be overkill for what you want to do. No harm in that!

Logic has extensive MIDI capabilities and features, it's what I use for sequencing. For recording and mixing though, I don't go near it, because there is better for much much less. Who knows though, you may really like Logic's audio editing/mixing capabilites.

I've never used DP, but I've used Audio Desk for years, which I think is a stripped down version that is just audio. It worked flawless for me recording rock bands and basic mixing.

OH, btw, Audio Desk is alot like ProTools in terms of interface and functionality. It likely does not have MORE features, but you say you need the basics, so why are upgrading from PTLE?