I will have a few days in Dublin before my Best of Ireland tour and I'm considering the hop-on hop-off buses. There are 2 that I see... DoDublin and the BigBusTours. Is one of them better than another? Which one has more frequency? Is one more crowded than the other. What are the pluses and minuses? Thanks for your help.
Flip a coin. When you get to Dublin, you will find brochures for both companies. Read them and decide.
DoDublin is with the city bus company and if you plan on taking a bus from the airport (Airlink), you can sometimes get a combination ticket for both the airport bus and the hop on hop off.
On my trip from airport to hotel last year on the 747 Airlink, our driver even pointed out a couple of sights as we drove by. I thought that was really above and beyond.