I have read somewhere on here that if your children are under 18 and they are in a second room, they almost always give you the connecting room. Now, I have no experience with this as I have two children and have never 'needed' this request. However, we have traveled with family a LOT and requested connecting rooms. Almost always the request is granted. Now, we have not always taken it as there have been times when we could get a better location by having them separate~ but we've traveled with family at least 7-8 times and each time, the connecting room request has been offered~ and we didn't have a reason other than~ traveling with family.
I think I would do 2 separate rooms and request connecting rooms~ telling them up front that you have children under 18 that will be in the second room. I feel like that option would probably give you more space and the price is almost the same as a suite~ like very close to the exact same. Plus 2 bathrooms. I'd check into that~ I feel like with a family of 6~ your request would be granted.