I’m only commenting on the size and comfort as I don’t know the rules for number of guests allowed per room etc. For the current configuration, I would recommend the suite as the relaxation room could be a bit of a tight squeeze unless the furniture are moved around to make space. The suite has 2 toilets vs 1 in the relaxation room. Suite has a sliding door to separate the lounge area from the bedroom. Spa bath are in both rooms but the one in the suite is large enough for 2 or more. Current lounge in the relaxation suite is big enough for a child to sleep on, not the one in the relaxation room so you’ll need a rollaway bed for the suite vs 2 for the room.

However, if you book the relaxation room, you might be able to request for the renovated room (very limited as renovation is ongoing and they don’t assign these as upgrades) where there’s actually a divider between the room and the lounge area. They’ve also reconfigured the room and have installed a new leather lounge and chaise which is actually big enough for 2 small children to sleep on comfortably but there’s also sufficient room to put an additional rollaway bed. Here’s a pic of the lounge area of the new relaxation room.