There is no doubt almost every major DAW on the current stage has a ton of parody when it comes to audio and audio recording. Logic does what Pro Tools does as with Studio One, Cubase or Reaper. The workflows can be slightly different but by and large, they're all very, very good and far more capable than most home enthusiasts could ever possibly take advantage of. If there is an advantage in audio is has to go to Pro Tools for its "best in class" audio editing capabilities. The rest is apples to apples.
That however is definitely not the case when it comes to midi and softsynth production. Keep in mind the workflow component is much more important in a midi-only environment, as a clumsy midi editor can slow things down in a major hurry and make creating music secondary to futzing with software. For years Pro Tools was an almost unworkable midi solution and although they've made major strides they are still not in other players' ballpark. If one is content in staying with stock instruments there is nothing that comes remotely close to Reason+. What was once a bit of a novelty has now become an industry-leading synth production solution. There are enough proprietary synths on board to last a lifetime and many of those synths have matured into world-class sonic sounding instruments. Their new physical modeling plug-in Friktion is a stunning string synth that frankly rivals some of the Spitfire/Project Sam high-end libraries. There are endless arpeggiators and chord creators to make it difficult to even audition a portion of its bottomless production tools. Its midi environment (workflow) is as good as Logic, maybe better, and it now is capable of using third-party soft synths. It also runs in other DAW's as a plug-in. If your description in your original post is accurate this solution would be my absolute first pick and by a country mile.
Studio One has made ginormous leaps and bounds in the DAW arena and I find it the single most intuitive workflow in the industry. In a recent "Production Expert Magazine Blog" the most used DAW in the industry was obviously Pro-Tools followed by Logic, yet somewhat surprisingly, Studio One was right on Logic's tail. That's pretty amazing for freshman production software. It covers both audio and midi as well as anything out there. It's as simple or complex as you want it to be. It has a formidable line-up of softsynths. It's a completely drag-and-drop environment that exponentially speeds up workflow and all these compliments coming from me, who works 10 hours a day in Pro Tools.
So....without a doubt, if you want a dedicated synth environment, and as I mentioned, nothing can touch Reason+. Just nothing. If you want to invest in something that can split the difference between audio and midi I certainly look towards Studio One. It has a fairly large stock synth library. It handles audio in the most intuitive fashion in its class, and further, its midi environment is as capable as any of its competitors.
I think one can argue the pro and cons of DAW's endlessly when it comes to audio production. As I said, they're all really good and the differences are minuscule. But, for synth based midi environments a stock copy of Reason+ really has no peers.