I am having a hard time choosing between a Chicco Nextfit and a Britax Clicktight, either the Boulevard or Advocate. My Daughter is 18 months and very tall and skinny, 60% for height but just barely 20 lbs. I would like to keep her rear facing for at least 2.5 more years. The seat will need to be easyish to install since it will go between my mom's and mil's cars. One is a camry and the other is an altima. Both have latch where the car seat will be so I am leaning more towards the chicco in that regard. But the nextfit doesn't have the safe cell base which sends me to the britax. I like the deeper sides on the nextfit but worry about it getting too hot in the summer. Has anyone used both or have strong feelings one way or the other? TIA