The right question to ask should be- "Which credit card offer fits me the best? " Because one individual is different from the other individual. Their needs differ and hence their living styles differ too. So for coming to a decision on which credit card offer is best for you, you have to evaluate your needs in relation to your way of life and your spending habits (and not go just by the suggestion of someone).

For example, if you regularly travel by plane, a co-branded airline credit card offer might be more matched to you than the all-purpose one. These airline credit cards offer rebates, discounts and other kind of incentives when the holder also use it for making payments (the incentives are even greater when the holder used it  for paying for airline products or the airline tickets ). Some airlines have their own credit card supplying company from where you can get really nice credit card offers.

For people shopping at a special retail store or a supermarket a good credit card deal would be a card that offers discounts, rebates and rewards on shopping.
Similarly, if you have a preferred retail store where you do a great deal of your shopping, it would be useful to check if the seller is a credit card dealer too and if there is a credit card offer that fits you. Several giant retail chains do offer credit cards that are co-branded to their clients. These co-branded credit cards offer discounts and rebates when they are used for making payments at the retail store. With these credit cards you get reward points for making payments at every place but the rewards are higher on the payments made at retail store.  Other examples for co-branded credit cards are grocery stores and gas station

So, if you do your research well you will discover a bunch of rewarding credit card offers. But, this doesn't mean that you must join all the credit card offers. You have to evaluate your needs first and rank them. Then you need to consider which credit card offers suit your needs the best. And lastly you can make your selection and pick a credit card offer that covers up nearly all of your needs and gives highest benefits.