Which company is recommended? There are 3 different tour buses.
Is there a long wait between stops for another bus to come?
In April, we rode the green bus, DoDublin Hop on Hop Off. All three seemed to cover the same areas. We liked it. I didn't remember waiting long for the next bus. The DoDublin had discounts at various locations.
A few years ago we had a poor experience with the "Green Bus." Very long wait times. Several competitor's buses came while we waited at the Guiness Storehouse. Possibly an isolated issue.