Toddler Carseat?

Depends on how old your child is. If your child is over 2yrs old, then either is a great seat depending on your needs.

If your child is under 2yrs old, please research extended rear facing. the Frontier doens't allow use for children under age 2 anyway, but if you research extended rear facing, Joel's journey, and internal decapitation, you will be looking for a convertible car seat.

If your child is over 2, either of the seats you listed are great. Just play with bot and see which you prefer.

Britax all the way!!

I bought mine at the Albee Baby website, so much cheaper than anywhere else. Around $100 cheaper than babies r us!

I have both. The Frontier is the better long term investment, IMO.
I have written about this subject so many times I feel like a broken record :) ...but if you can go to BRU and compare the two you will see the differences.
Thinking back what really cinched it for me was that the seat size is so much more generous on the BF.
I have a hard time believing my DD will be able to sit in the GN as long as the BF. And she is a bean pole.

BRITAX!!!! I wont put my son in anything else. But if money is an issue, Graco is just as good.
But I did get my Britax on ebay (brand new) for the same price for the Graco. So there are deals out there.

We have a Nautilus and have no problems with it.

I have the Graco Nautilus and wish I had the Frontier. I dont like the placement of the bottom strap on the graco. Its too far back and you have to dig around for it to get you child strapped in.

If money is a big option, the Graco is still really good. Other than the seat strap problem, I love it. Its got a nice cup holder, and neat places to store little treasures under the arms. Its a good, versatile, safe carseat. Also, it has a liner which is really easy to remove if you need to wash it.

I bought the Graco online for about $145 which was significantly cheaper than the Britax.