I have not tried Sonarworks. I have used the Mch PC version of Dirac quite happily for years. The do have a VST plugin for playback, but technically it is still a Beta available only on special request, although it has been out for a couple of years. I have been very happy with the VST plugged into JRiver.
Dirac 2.0 is also currently in Beta, but they are doing a really terrible job with the Beta. Functionality has been stripped down in major ways, like no Mch yet. Supposedly, it will be fully and officially VST-oriented and it will support up to 384k sampling on a PC, up from 192k currently in 1.0.
Dirac is much more of a consumer and semi-pro package than others. Limited versions of it even appear in some luxury cars. It does support extensive target frequency curve editing. But, it lacks many user control features and options that Acourate, Audiolense, etc. do have, if you feel you need and want them. Dirac's algorithm appears to be very sophisticated internally, although something of a proprietary black box, but it is still quite easy to learn and to use. Others seem much more complex to learn, calibrate and use.
It is also entirely predicated on multipoint averaging, unlike many other tools which are single point. This makes it difficult to perform accurate, independent post-calibration measurements, if you feel the need. And, arguments do rage about single vs. multipoint, inconclusively in my view. Calibration is still fairly quick, in spite of the multiple mic positions.
For my use and from a sonic standpoint, I am highly unlikely to switch from Dirac. I have recommended it to others, and they have similar levels of high satisfaction with it, replacing Audyssey+Audyssey Pro, for example. But, for those who like to tinker and fine tune things, other choices may be the way to go. I personally prefer to spend more time listening to music and less time learning a complex software suite and tinkering.