Sibelius hasn’t changed much in the four years since Dorico was launched, but Dorico has changed a great deal. So old comparative reviews are not going to be very useful.
IMO the best option would be download the trial version of Dorico, jump in, and ask here if you get stuck.
As the other answers said, don’t assume Dorico works the same way as Sibelius, and trying to make it work the same way is likely to be frustrating (and unproductive). Check out the tutorial videos from Steinberg to learn the basics. The monthly “discover Dorico” videos (about an hour each) are a good showcase for more advanced Dorico usage for specific applications (e.g. customizing playback using sample libraries, writing for percussion, etc).
Just as a teaser, the question I answered just before this one [SOLVED] Multiple Time Signatures for a whole piece - Dorico - Steinberg Forums is something you don’t have to “fake” in Dorico - which surprised the Sibelius user who asked the question 
FWIW Daniel Spreadbury has stopped publishing comparisons of Dorico and other software:
I think at this stage any more development diary instalments that call out deficiencies in other products might be considered bad form, or possibly even gloating.