Twin. I don't think you have room for the larger size.

Twins You don't have the room for larger.

If you want the girls to be able to play in the room & have room for a dresser, you might want to consider bunk beds.

It isn't shown very often, but having the beds at right angles provides both storage and space to play

Twin bunk bed. You'll want to give them each a dresser and bunking the beds will give you the floor space for that. The two year old can sleep in the crib or on a mattress that pushes under the bed during the day until the four year old is old enough for the top bunk (I generally allow it when they are able to climb down without help, usually at 5-6.)

Alternatively, you could start where my kids inevitably end up and give them one full size bed to share. Lots of kids prefer it; you'll know if yours are that type because they are in your bed every night! Even though my kids each have their own bed, at least one bed is empty every night because they sleep together :)

Twins.

I don't recommend bunk beds. I just finished making the bunks at my cottage and they are a major pain to make, especially when they are against a corner wall. Two twins is a much better solution. Also no fighting over who gets the top bunk etc. I always found the bottom bunk to be claustrophobic.

Some of those examples posted above are really gorgeous. You can make a lovely room for your girls with those ideas.

Those ideas with the corner beds is a good use of space allows for book storage.

You would have a hard time moving around in the room and making up the beds with 2 Full Sized beds.

Twins with storage. And another issue with bunk beds is that dealing with a sick child in a bunk bed is miserable for all concerned. Bunk beds IMO are only good if you are REALLY limited in space or if the bunk is only used occasionally, like for sleepovers.

Full over full

Kids Langan Bunk Bed, White, Full Over Full · More Info

CorLiving Twin over Full Bunk Bed, Pink · More Info

Got twin beds for grandsons at our house. Maybe boys are just more rambunctious than girls, but no way these two, 7 and 11, could share a bed without major screaming matches. The last time we tried it, we had to put a wall of pillows between them. I grew up with a sister, and we had twin beds and enjoyed “our own space.”

I bought a twin bed for my daughter when she was about 2, but it wasn't too many years before she constantly complained about having such a small "baby's" bed.

My sons had twin beds up through college. The younger one took his twin to his first apartment.