At $500ish plus why not just get a SWFA SS 3-15x42? Its only $600 on sale and a better made scope than either you listed. I have no experience with the Athlon but the S-TAC is fairly nice. I would suggest the 4-20 though over the 3-16. Weight is very similar but optically speaking i like the 4-20 better. The eye box is also a little less fussy. Both are ok for the majority of the magnification range until you get near the max. Not a huge deal for paper punching but for hunting im not 100% thrilled with either. If i was going Athlon it would be a Midas TAC 4-16x44 but the cost is just too much imo.
https://www.swfa.com/swfa-ss-3-15x42-tactical-rifle-scope-3.html
