I am considering one of the following booster seats to use as an occasional carpool seat in my 2004 Honda CRV or 2003 Honda Accord. It will be in the center position, with Radian 65 and Britax RA on outboard. It will hold 5 and 6 year olds.

Which is a better choice and a narrower seat:
Graco Turbo booster
or
Fisher Price Safe Voyage Booster

OR would I be okay with a backless booster since it is in the middle seat?

TIA!

JulieRobin