If those are the 2 options, I would lean towards the Lassen simply because I prefer that style. However, when DD was that age and we were looking to rent or purchase a special needs stroller, we ultimately went with a Maclaren Major Elite. It's lightweight for folding and carrying on WDW transportation, easy to push, she was comfortable in it (still is even though she is much bigger and we rarely use it now). However, it doesn't recline if you wanted that for her nap (DD would nod off sitting up). Do you have insurance to help with the purchase? If not, the Maclaren is considerably less expensive; another factor for us.
Enjoy your vacation!