Thatās my dilemma, too. I used AI for many years for illustration projects. Coming to the Mac, I found that unless I buy AI for the Mac as well, there are barely any apps that measure up to it. Letās not forget that AI has been around for 20 or so years. It has features and tools that the new, fresh apps just simply cannot match and donāt have. For simple stuff (such as basic logos) any of the above mentioned app will do.
Unfortunately, I think the problem is that most vector apps rely on the basic tool and feature set that the standard Mac library offers. Basic line and shape manipulation, basic coloring, basic booleans, etc. In other words, basic this, basic that, basic other, etc. They wrap a different UI around it and call it a day.
I guess Affinity Designer is kinda ok (personally I am not a fan of it at all). It has quite a few bugs, and lotās of annoying, unfinished features. They advertise it as ā5 years in the makingā, but if you worked with any number of years using illustrator on a more serious level, you will find that it translates to more like ā4 years of brainstorming and 1 year of codingā.
Sketch is great, but itās really not for āillustrationā illustration. Although you can get by doing basic logos and such. Itās great for UI and layout design, etc.
Autodesk Graphic is not Autodesk at all. They just bought the app not long ago and they only changed the ālogoā on it. I think itās still quite basic compared to other apps.
For me one of the biggest problem with all the available vector programs for the Mac, is that they all offer more-less unique features on their own, but not in a single package. As in, one app offers a unique feature, but not the other. But the other app offers a unique feature that the third one doesnāt have, and so on.
Eventually, depending on what your needs are and how important certain features are to you, I donāt think thereās an āillustrator killerā - as they say - for the Mac at this point. There are āwannabesā out there, but in all seriousness none of them match the power and might of an app that had 20 years to mature.