For my work, over the last ten years, in drafting and design for Video Engineering/Installation projects, sadly, Windows had the best alternatives and I was forced to use it. However, Vectorworks has developed a good rep for the lighting industry (Spotlight) and the architectural industry in CAD 2D, 3D drafting/production. There are all sorts of offshoots in the engineering-specific areas as well. I like their approach.
I don't know how you are with using remade libraries of device information, but to that end, building up your own libraries of design elements) is quote labor intensive, if you go it alone (have to do it all yourself). Many good apps provide a lot of pre-made libraries which are time savers in a business model. Check their quality carefully. Some use SQL Libraries translating objects to object with data inside a database(s) to manage your program elements by cut & paste or drag & drop.
The difficulty with the product on Windows platforms is that they don't translate well to Mac especially if you try to use them in a virtual environment (Parallels, in my case). I had major problems with the package I invested in (WireCAD) and it still gives me heartburn thinking about it. If you plan to specify Mac for all your work, you'll want to investigate the alternatives for CAD very closely to get a good fit before you're stuck owning it, not after. While support is nice, a bad CAD package cannot be made to smell any sweeter by support.
Almost all the suppliers have tryout versions. Get input from people that use them, too. Also, define what you're looking for in terms of the kinds of production you'll need, the kinds of libraries they'll provide, expansion of libraries going forward, cost initial and ongoing, the output they provide (large format media printers, etc). You will be surprised at the results of direct questions about these areas. Many of the most popular products are locked out of direct support for modeling, printing, multi-language support and display.
So in general, the old rules apply- caveat emptor. And be especially aware of the oft-used phrase, "It'll be so much better in the next version."