Hi paisley,
I would normally suggest that if you have two choices that seem roughly equal that you choose the firmer of the two but you are very petite and light and while both 24 and 19 are in the “soft” range … I would probably lean towards the 19 unless you have a preference for something slightly firmer.
It may be on the table or even on your plate but before you “eat it” … I’d make sure you read this thread.
Phoenix