Should I replace one credit card for one with better rewards?

I would advise you to go ahead and get the credit card with the better reward policy, unless your current company is willing to make you the same deal. If you get one new credit card it won't affect your credit score, but if you apply for a bunch of credit cards that WILL affect your credit score, so bear that in mind.

Yes, your debt to credit ratio has to do with your credit score as does how you pay your bills. Just pay the card off and keep it without using it. Having cards that are close to the limit is bad for your score too. If you have $10,000 worth of credit total (with all your cards combined), but only owe a small fraction, or none, of it your debt to credit ratio will look really good.

it looks better from a credit report standing and when its pulled if u dont cancel the card or close it. just pay it off and stop using it. get the other card. i have done that in the past so its no big deal. as long as u dont carry or transfer balance ur all good :)

Your credit scoire is determined by how you pay your bills. It has nothing to do with you dropping one credit card for another.

No it shouldn't hurt your credit score, just make sure you are getting a better interest rate also.

Sure,if the other card,better offer than the other.

Additionally, One thing I know is that you should make sure to redeem all your rewards PRIOR to closing - or else they will be forfeited!!!