Which Citibank card do you have and what is no good about it? I'm not aware of any problems with the Citi PremierMiles Visa card which I have.
For me the aspects to consider are:
- acceptability (any Master or Visa is fine, Amex less so, Diners, very much less so)
- annual fees (pretty much any card in HK (perhaps except the very top end Amex ones) will waive them on threat of you closing the account)
- foreign exchange rates & fees (in my experience they don't vary enough between HK cards that I have looked at (HSBC, Citi, Amex) for this to be significant with my level of overseas spending)
- other features (e.g. Octopus AAVS, which most now seem to have)
- mileage / cashback / other bonuses (this is where you can shop around for deals - I now try even harder to avoid using my HSBC Premier Mastercard since they have just taken the miles earning to $15=1mile and an annual $300 programme fee for mileage; the CX Amex had a good introductory offer which is now over, but is still not bad at $8=1AM in HK, $4=1AM overseas, without limit, as is the Citi Premier Miles). I value AsiaMiles at US$0.01, so in effect that is a 1% rebate locally and 2% overseas. The CX Amex is free without debate if you are a CX Marco Polo member at Silver or above, and comes with a load of travel & purchase insurance and Priority Pass membership. The Citi Premier doesn't have insurance, and only has lounge access in Hong Kong (but that does include supplementary card holders, whereas the Amex PP is main card only). You can get better mileage/cashback promos with limited maximum amounts if you're prepared to keep looking around applying for cards just for the promos and keeping track of your spending on each one. But that's too much like hard work for me.
Interest rates should be irrelevant since using a credit card as a source of financing is madness.