All the banks on-Island offer online banking, but some are definitely more user-friendly than others. If online banking is important to you, it is worth asking about each bank’s online capabilities. All banks allow you to pay almost all your monthly bills online.
ATM machines are available at most bank branches and all supermarkets. If you use your own bank’s ATM you will not be charged a withdrawal fee (other than Government’s 25¢ stamp duty charge for every withdrawal). The charge to use another bank’s ATM is CI$2.40-CI$3 depending on the bank, for each withdrawal. If you need a cheque book on your personal bank account, make sure to ask the prospective bank if they offer this service, as some do not.