All I can tell you is what we'd want, but that's of no use to you ...
Which boat is right for you depends on a lot of factors, and personal preferences that aren't factual at all.
Maybe you can start with a list: write down what your future boat MUST have (dealbreakers). Maybe a keel
? Minimum size bunks? Headroom
Whatever - this is your list to write
Next to it, add a column with whatever you'd LIKE your boat to have that aren't dealbreakers but things you're willing to compromise on.
Next, search for boats (in your area) that fit the MUST HAVE list. Take a serious look at these boats and see which ones you like, and why. And what you don't like and why.
Both mono's and cats have their pro's and cons - some simply cos of the number of hulls, some depending on where you sail them or even the current route
For now, my $0,02: don't focus on the number of hulls so much but more on which boats you like, what your dealbreakers are etc. and then work
out which boats fit the bill ...