I used a Mesa 20/20 with a Pod Pro for a while. It sounded pretty good. It is light and sounds warm. I haven't tried the Marshall so I can comment on it.
Remember, technically you don't really need to use a guitar
power amp. You can just use a solid state studio or PA power amp as well since the Pod is modeling the output power amp. You may be able to get an even lighter and cheaper amp this way.