I'd say 90% of us shoot 50-60 or 60-70 lbs bows. The 70-80 bows are for big game hunters or the He-Man types. Not too many beginners should be shooting a 70-80 lb bow.

Honestly the best advice I can give you is to sell both of those bows and take the money to a good bow shop and have them set you up with something like a Reflex or a Fred Bear. They are great bows for not alot of money. The pro shop will get you off to a good start and you'll enjoy yourself much more.

Welcome to the sport and good luck to you. You've found a great community to learn.