In my opinion, the best option is Cinema 4D.
It's widely used not only for motion design, but for architectural scenes as well. While oldfags use 3DS, C4D is developing and the number of C4D users is increasing rapidly. Furthermore a wide range of collections and models is available for C4D. Among them there are some giant manufacturers like Evermotion. Some of these collections are available only for C4D and 3DS.
In case you integrate into C4D you'll have almost zero competion, since Vray has not been developing for 1.5 year. I'm sceptical about Octane renderer perspectives as well, cause it is so-o-o slow! Mental Ray is buit in, though I've seen nothing more than a terrible beta. And according to my experience it is also slow, not realistic and very uncomfortable.
Other 3D programms are either unpopular, either underdeloped or free.
I would like to know if I can somehow provide you with finantial help. Maybe you should start a donation program? I'm sure that there are many C4D users willing to help you to raise some funds and start working on intergration onti C4D.
Sorry for my bad English .