hey hey barratt
as joe32f mentions, different entities.
rometaxicab is in rome georgia, be very careful
rometaxitransport.com is another private one. how many people determines how much, what size car/van is needed and how much luggage you have. when and where are you planning this cruise?
are you staying in rome itself or hotel near the port? the port is an hour or so from city center, few years back we took a cab to port, easy, we paid 140E back then.(had issues in rome with roads blocked from student/teacher protest, grabbed the first ride available) ask how close they get to embarking the ship?
book your taxi's ahead of time, one less stress. with as many people wanting to get to the ship, you may be waiting a long time in line or on hold at hotel, counting minutes and shaking in your boots to get there.
always keep their phone number and taxi co. name with you, most have whatsapp.com just download it on your phone, free calls.
check rome2rio.com to see what's offered, but do book with company your decide on.
aloha