[pat2man]

Fusion and Parallels both are a bit faster than VirtualBox and have more features.

Also, VMWare VMs will work with any VMWare product so if you are working with a team that uses VMWare elsewhere its nice to have.

If you are just trying to run a Windows app or two you are probably better off with VirtualBox since its free.

[Uchikoma]

My reason: I've been using VirtualBox for running dev server environments. What happened: VM shutdowns, without any way to start them again (buttons just gray), files corrupted, interfaces lost, ....

[evilduck]

Except for OSX VMs built using Fusion's built-in capabilities. The other VMware products don't ship the required libraries to boot them.

[yardie]

You have to downgrade the vmx to prep a fusion vm to be loaded into esx. Or you can download the vmware convertor app that will transfer the vm, convert the vmx, and register the vm in esx.

I use the application weekly for this task.

[evilduck]

I meant OSX as a guest OS.

[yardie]

For that you'll need a machine with SMC and only Macs have it.