I find Cubase Pro to be deeper with MIDI editing, which is what I do more of than anything else. Logic is more CPU efficient and stable - which is important. Cubase is doing better with the latter now they have Sentinel that tests and blacklists naughty plugins that can bring down your session.I love what apple has done with logic. It's one of the products with which they've done their best. -- at least in the sense that it's probably the best value pro music production app; filled with high quality processors and instruments.
I wasn't sure what to think when they bought it from emagic all those years ago. While it was neck and neck with cubase and cakewalk back in the day, it's now definitely a step above that competition.
Pro tools is still more widely used in top studios, but I believe that has more to do with legacy since a decade ago computers needed extra cards with DSP chips to handle large projects; and what's more, Pro tools is only preferred by many of those who are recording and editing live music rather than having a electronic production focus.
And... for what it's worth, GarageBand is nothing short of remarkable for its price: $0.00
I also hate the dongle which obviously was jettisoned from Logic a long while ago.
Logic probably has the edge on the number of good quality built in instruments and plugins, but Steiny have gone a long way to redress that imbalance over the last few years.
I like both, but will always feel more at home with Cubase as I've used it since about '93.