This comes up frequently. Frankly, I don't think there is a "best" system, though there are a lot of good choices.
Some people shop for lowest price. There's some pretty cheap stuff out there that'll run a list of music files, and that's good enough for some. Some need local or remote voice tracking, and there are systems that do that very well, and others that don't. If you need your automation to pull a stream out of the internet, a few can do that, and some don't. You need to factor in whether anything comes in by satellite, if you need incoming triggers, input switching and/or the ability to fire off external relays. The ability to build "carts" with multiple cuts that can be run in sequence or at random matters to some. Some systems can generate their own music log for the day while others have complex daily logs that need more sophistication.
Transitioning from one system to another is almost always clumsy and painful. Getting past the learning curve makes true believers out of people, because they resist learning something else, even if a different system might be better. That could affect what system you choose.
The best system for you will depend on what you need from it, what priority you place on your criteria. Whether you need multiple stations and/or production units attached, whether you're comfortable with "build it yourself" or need the computers, software and audio cards provided will affect cost... and that will whittle the list of prospective systems down to a much lower number. Will you need external music or logging software, or do you already have that?
Finally, consider what kind of support you might need. Some systems are more-easily understandable to the "dangerously conversant", while others... not so much so, or might even have proprietary files you can't easily modify. Consider what your local talents are vs what you might have to pay the software people for support time. Also note when they're available to you. A couple of systems are made overseas, their time zones are dramatically different from ours and their phone people aren't very understandable.
If you want reasonable opinions from the group here, some of the above info would help a lot. Even then, you'll get a list of our personal favorites, which may not wind up being yours.