Hi Chris!

Sorry it has taken awhile to reply to your question. Firstly, what budget are you working with for each car seat and what vehicles do your daughters have?

One of the most important aspects to choosing a car seat is whether or not it's compatible with your vehicle, if it's not compatible with your vehicle - then it's not safe to use. Another important aspect is whether or not it's easy for your daughters to install and use, if it's far too complicated to use and install - then it's possible that it just wont get used properly at all. Easy to install and use usually = used most correctly, most of the time.

There's a huge variety of car seats out there to meet the needs of most, but things like whether or not it's compatible with your car do tend to be the deciding factors.