Arghh, much as this thread title irks me and whiffs of privilege etc etc

I am looking at boats for the first time.
Something between 30-40ft.
Sail, not motor.
Blue water capable.
Big enough for 4-6 people as a live aboard/day charter etc

Not had much experience of cats (beyond coastal Hobie sailing) but am having my eye drawn by the living space and the lack of rocking on anchor. Am obviously doing lots of online reading but know that there is a lot of knowledge on this forum, and a seemingly sizable bunch of sailors.

My question is; am I overlooking something fairly fundamental (other than higher birthing/marina fees) by choosing a cat over a mono? would insurance, repairs, reliability, value for money, ease of sailing, handling on crossings etc be issues, or are they comparatively the same?