As a cruise junkie (40+ cruises), a professional travel writer and photographer, and a normal human, I never leave home without my Apple iPhone X. Despite this, I would never go on a cruise with just a smartphone or tablet as my only camera.
Most of your cruise clients probably own smartphones or tablets. For the past few years, these devices have had state-of-the-art cameras built into them. Under most situations, they produce some great pictures. Sending photos to others via emails or texts is easy, and all the images are stored in the Cloud where even you can’t lose them. Most importantly, clients will be shooting with a camera that they already know how to use.