Adam,
I am no expert, but I have used a professional's Blaser R93 for most of my stalking. Great gun, but I couldn't stretch to one when I bought my own set-up.
I tried a Mauser MO3 in a shop and noticed how much heavier it was than the Blaser. I understand Blaser and Mauser are owned by the same company or group and certainly the quality of the Mauser is very good as is the Blaser's.
In other words I suspect the choice is really about what weight of gun you prefer!
Neal