Hmm…well I’ve done a boat tour of Ghent as well as one of Bruges. To me the one in Bruges was better but also neither really are able to get to highlights.
In Ghent you may start in the Korenlei area which is interesting but you can see it as easily on foot. The boats seem to take similar routes as I was staying at the Ghent River Hotel and they all seemed to turn around under my window, lol!! They usually show you the exterior of the Gravenstein Castle. The big cathedral, Sint Baafs is not on a canal nor is the City Hall.
As I understood it the canals were used to ship goods so were not necessarily in the main square areas.
I’m not saying not to take a canal boat ride, just saying the things I would consider highlights in Ghent couldn’t be seen by canal. To me the most fabulous thing is the Ghent Altarpiece, The Adoration of the Mystic Lamb located in Sint Baafs. It does need a timed entry and has an Alternate Reality program that I enjoyed.
I’ll also admit to having been on a canal cruise in Amsterdam and Haarlem, lol.