I just discovered these products. My wife and I visited Dublin about 3 years ago and did the main attractions. But, we are OK doing HOHO again. We are spending 2 days in Dublin. We will be spending some time in Dublin on genealogy research. Then, we need to get to the airport to pick up a car rental. We are arriving in Dublin on a cruise ship. So, we only need transport to the airport. Any advice on which one of these would be the better option. Thanks for your responses in advance.