When you do your comparisons, there are key features you need to examine. Here are some of them.

Introductory interest rate. This is usually found on cards encouraging you to transfer balances from your existing cards. This rate is applicable only to the transferred amount and not to new transactions. This is useful to you in situations where you have significant balances at a higher interest on one card and you want to pay off this account at less interest cost. Aside from comparing the introductory rate, also check the duration of the introductory period. Depending on your needs, a 2.2% introductory rate for 12 months may be more suitable than a 1.99% rate for 6 months.

Purchase rate. This is the ongoing interest rate that would be applied to your new purchases regardless if it was made during the introductory period. Consider this carefully as you'll have to live with it for as long as you keep the card. If you usually pay off the entire amount in the statement as it falls due, a high ongoing rate will not matter so much. But if you intend to carry some debt, a lower ongoing rate will be important to save on interest expense.

Rewards program. Your comparisons can include the availability of rewards or loyalty programs. There are special cards with reward schemes, and you will notice they tend to have higher interest rate on purchases and/or higher annual fees (these help pay for the reward items). You stand to reap the most benefit from reward credit cards if you pay off all amounts due each month; otherwise, the added interest you pay will offset any value you get from the reward.

Consider the value of the offers by calculating how long it will take to earn points and how much you have to spend to get the reward. One scheme may give 1 point for every $1 spent and require 10,000 points to earn the reward. Another may let you earn 2 points for every dollar but you have to reach 25,000 points. You'll spend only $10,000 on the first one, but $12,500 on the other.

Annual fee. In your research, you'll likely notice that credit cards with more promised benefits, such as rewards and low interest rate, usually come with higher annual fees. Conversely, credit cards with very little frills (and higher interest) do not even charge annual fees. If all you want out of credit cards are the basic conveniences and you pay off everything due for each month, you can opt for the basic card with no annual fees but be sure to arrange for prompt and full payment of all bills to avoid the high interest.

Interest-free period. This refers to the period when your purchase transaction will not attract any interest. Many products provide you up to 55 days. But if you closely at some credit card applications, you will see some cards have as many as 62 days while others may have only 44 or 45 days. Credit cards with longer interest-free periods are obviously better for you.

Apart from the key features above, you will also want to compare their various fees, such as over-the-limit fees and late payment fees. If you manage your account properly, these fees will not concern you, but it's always good to have them in the back of your mind, just in case.