Working with Orb Producer Suite and Captain Plugins regularly, bought Liquid Music in the actual sale even if I failed on the demo years ago.
I think Orb Producer and Captain plugins are from GUI (Captain plugins was years before Orb producer.....

and (easy) handling very compatible but very different in the engines in the background that drive that "generative" or whatever aspect.
While Captain plugins is (mostly) based on styles and presets (apart from the melody generator which is - as far as I know - the best out there for the "easy" ones - so that dont cover Rapid Composer for example) the generative engine in Orb producer is based on Orb Composer which means really generative based on theoretical parameters that are more or less understandeable (for example I still dont really understand the connection between "Density" and "Complexity") but gives you real freedomn in generating ANYTHING.
Its easy to use in general but as it is STILL badly explained (these videos in cartoon tempo are a bad joke to me....) some very important basics that really makes the power of this app are sometimes hard to find (not because they are difficult or complex but cause they are simply NOT in any manual
and not explained anywhere else).
Liquid music years ago I failed on the one hand just getting into this on the other hand had lots of contact with support with requests and questions. Now years and some bigger updates (which seem to solve some of the requests) have gone by and I am just to interested in the concept to not give it another try now. So I cant really judge the actual version at the moment.
Simple conclusion: for me there is no "best" of the three cause the concepts, even if the GUI SEEMS quite similiar (I wont comment more on this...), is absolutley different. For me at the moment the decision between Orb producer and Captain plugins is song-idea based and composing-needs based. So for example if I have a generative midi track from Wotja with no chords or anything for further use I choose Orb Producer 2 for its new harmonize midi function. If I want to sketch something quickly where the existing mostly "modern" patterns might fit for a start I might take Captain plugins which had the plus for this of an integrated drum module.
Just my 2 cents.