I think having kids that close I would do the 2 seperate cribs that turn into toddler bed option.
We bought a crib from BRU for around $150 (i think) that turns into a toddler bed and then I think even a double bed. I wasn't exactly sure if we would use that as a toddler bed but at least the option was there. My first LO turns 2
in November and she is still in her crib and dosnt mind her crib (yet) and I dont want to rush her into a toddler bed because she's becoming a big sister. Alexis' crib now has teeth marks from when she was teething, so the plan is to buy another
crib that converts and give Alexis the new crib since she wont bite it anymore (i dont think anyways lol)
Plus we have a dark brown crib and changing table and alexis is using my white dresser from when I was a kid, so I want to get her a white bed to match the dresser. HTH :)