You're better off to try and use the suggested keywords that show in the drop down when you search, because that's how the buyers are shopping.
Plus, you don't want too many duplicate titles, and since we are an international site, there may be other words you could use... I know that strollers are often called prams in other countries, just as they call the trunk of a car the boot.
I'd try using a few of the different ones ... and check your stats to see what keywords are being used to find you items and use those in your tags too ;)