To offer any advice on which band of frequencies would offer more advantages there are a few things we need to know:

1. Where are you? (aka are both bands legal where you are)
2. What sort of bird are you flying and what sort of quarry?
3. What is the terrain (open country, forested, etc)
4. Do you already have any equipment and on what band?
5. Do your hawking buddies or relatively local falconers have equipment and on which bands?

There are probably more questions but that will get us started.