If the the terms and rewards are equal does it make a difference who the card is from? Is one harder to get than the other and will it affect your credit rating??

neither. Stay away very far away.

No credit cards is the best.
If you simply must have - get an account at a credit union and get a debit credit card there.
That way no charges will transact if you don't have sufficient money in your account.
This my friends is the best way to stay out of debt with your Credit Card. N o use charging if you don't have the money.