That's a whole another ball of wax. First pick SFP or FFP. I've always been an SFP fan but the last 5 years have realized how much I appreciate the versatility of an FFP for how I hunt. I would also recommend sticking with SWFA over some of the other more advertised options. Since I've started using SWFA, when I go to "check" zero, I'm not going need to adjust anything based on the scope losing zero.
For magnification and objective size, pick something that works for your intended use. As long as it has a low enough magnification on the bottom end you can pretty much hunt with anything. If you're hunting in the dark woods it might be nice to have a larger objective.
