laptop for consulting - VMware or Hyper-V ( 64 bit vms needed)

Hello,

I am moving from a job as an Enterprise IT person to full time consulting - visiting different clients on different weeks, etc.

My main functions will be around Active Directory and different versions of MS Exchange.

I always had readily accessible test servers, now I think for demos, studying,  testing scritps, etc. that I will need to have 64 bit virtual machines ready on my laptop whenever I need them.

I have reviewed this person's blog to see his notes and wanted to ask for feedback here to see what others are doing:

http://blogs.technet.com/daven/archive/2009/01/08/hyper-v-on-a-laptop.aspx
http://blogs.technet.com/daven/archive/2009/01/09/building-my-demo-laptop-part-1.aspx
http://blogs.technet.com/daven/archive/2009/01/12/building-my-demo-laptop-part-2.aspx
http://blogs.technet.com/daven/archive/2009/01/16/building-my-demo-laptop-part-3.aspx

I am assuming my options are VMware and Hyper-V, which one would you choose? Why?

The ideal setup would let me use MS Office apps ( outlook, word, visio ) as well launch the virtual machines.
(if you say I should have my client os with the ms office apps in a vm I guess that would be fine too. )

I would like to use Windows 7 as my client os.

Thank you.