Hi Porter,
As others have said, it depends on the details of your cruising project. People will defend their own choices, so it's important to relate their point of view to their own project (which sometimes is not actually clear in the various online forum discussions). You will find more people advocating cats there because of simple demographics. There are a lot more people planning island hoping in the tropics than circumnavigating.
Statistics tend to show it: cats are getting more common in the Caribbean, for chartering locally in particular. The boats you will find cruising in farther corners of the world (NZ, SA, Northern Europe, Mediterranean, South America) are more often monohulls.
Another aspect is the crew. A lot of parents prefer Cats for the space they offer and the expected flat-sailing. On the other hand there are plenty of families cruising monohulls. I think kids will adapt anywhere so it's more the parents' choice for their own comfort.
Our choice for an Amel 54 was done long before we pulled the trigger a few months ago. We did plenty of research and read extensively online and we felt they were the right boat should we want to go anywhere in the world.
We (2 of us) just spent 3 months in wintery Mediterranean with rougher weather and the boat handled it beautifully. Fast, not that much healing (thanks to the ketch rig), and a lot of momentum to go through the seas. Boat movements were rather predictable depiste the typical confused sea state in the med. I would think a cat would have been tossed around a lot more. The protection of the centre cockpit is fantastic and we could spend night watches there in high winds, big seas and cold temperatures, managing canvas easily. I wouldn't have wanted to be at the backend of a cat, planning to go reefing the main in those conditions. Do-able, of course, and maybe fun the first and second time, but not so much when it's bound to happen again and again for months or years.
In conclusion I would rather sail an Amel around the world and would rather live on a Cat at anchor in the Caribbean.
Hope that helps,
Thomas
Garulfo
Amel 54 #122
Hyeres, France