Is there are a difference (other than price)? If so, anyone have a view about which is better? in particular, I'd like to know if one is better than the other for tucking under the table out of the way when not in use. And the reviews seem to say babydan is good for babies when they're little, but tripp trapp not so. Is this right? We've already got a great big cheap plastic thing with a tray but space is tight and might be time to upgrade.