The MVS and VM servers both have the same basic ADSM function, so you will
not be able to use that part as a determining factor.  Factors you should look
at are:

1.  Network connectivity
2.  Support personnel skills
3.  System capacity
4.  Performance

The MVS server has slightly better performance than the VM server due to some
better Disk IO capabilities on MVS than on VM (10% - 20% better performance on
disk related activities).  Other than that, the reasons to decide are based
on network bandwidth to the processor, capacity (disk/tape/CPU) of the
processor, and the comfort level of support personnel to run it.

To me the support personnel is key since they have to install it, configure
it, and maintain it.

Paul Bradshaw