I have never stayed in a suite but from what I read, 2 rooms would work better for my family.
My boys are presently 12 and 15, the 15 year old is over 6 feet tall and I'm sure the 12 (almost 13) year old will follow in his footsteps for height. I can't see my oldest being comfortable in a pullout of any sort. With two rooms, everyone gets their own bed (except my partner and i). The boys don't like sharing a bed. DD would want to be in the same room as my partner and I anyway and not with her brothers so in the suite this would be an issue as she would have to be out with them. With two rooms, she would be in the same room as my partner and I.
Also, from what I read, one of the pullouts in the LM suites is actually your table so if someone is sleeping in it your table is out of commission. What's the point of having a kitchenette if you lose your table every time someone wants to use their bed? Eating in the room isn't a big deal anyway, we wont be eating there much. If we do have something, the kids are happy parked on a bed watching tv. It is vacation after all isn't it?

At home the tv isn't even allowed on at meal time.
Either way you get two bathrooms, so that is not an issue even if one is bigger in the suite.
I know you are not guaranteed connecting rooms but it is a risk I am wiling to take. I just don't think we would be comfortable in the suite.
So, op, there's my opinion and the why of it.