I have the advantage of actually using both Modo301 and ZB3 in production environments, so I donāt need to speculate on Modo301ās sculpting ability. 
In terms of price, you pick up Modo 301 for roughly the same price as ZB3.1 via DAZ for the rest of the month. In terms of Organics, Daz sculpted the Victoria 4 model in Modo 103 (about 2 years old technology.) In Modo 301 youāll be able to start with a sub-divided sphere, just like ZB and sculpt away if thatās your preference. Modo301 wonāt have zSpheres, but having done both ZSphere and SDS modelling (e.g. box modelling) for years, I still prefer the control I get with SDS. Almost all my ZB ābase meshesā have been done in another application and imported in ZB.
As far as the rambling, well, thatās the moderating here. These messages were seperate threads that have been āmergedā.
As a pure sculpt environment, ZB3 will be remain superior to Modo in many ways. As a modeller that has to fit into an animation pipeline, Modo 301 outshines ZB3.
As for people using Modo301 and ZB together, that is also definitely in the cards. We used Modo 203 to post process our ZB models for months (no Mac Zmapper.)
I think the questions for Mac users regarding ZB is that the future is pretty uncertain. This is not delusion but cold, hard fact. ZB2 didnāt work on Intel macs, and no patches or support came to fix itājust work arounds that only would allow ZB to start about half the time. ZMapper didnāt appear on the Mac at all. ZB3 has been released, but without a companion Mac version and only a vague āsee you in monthsā and āweāre commitedā kind of statements, but no real schedule.
Modo on the other hand: Simultaneous Mac/PC releases. Universal binary almost from the first day. Regular updates (ever 6-9 months). Modo301 in Release Candidate now with a late Septembe release target. Weekly updates from their CEO. No limited activation via network (which is killing me on virtual machines as I have ālostā about siz ZB activations between Paralles, Bootcamp, and VMware.) Developers who participate in their forums, etc.