Do you plan on shooting both of these in their current factory condition or do you have thoughts of customizing them?
The Fireball should be a center-grip while the Weatherby is a rear-grip.
It depends on what you want and the uses you have for them.
I would much rather have a XP (center-grip action/single-shot) action any day if I was going to customize it over the Weatherby.
If you intend to use it in it's factory state then the Weatherby may be the best choice for you if you prefer a rear-grip design.
I have several tricked XP's and they do quite well (Yup, I'm prejudiced
).