We really like the Britaxes, and have narrowed it down to the Roundabout and the Marathon. A is a pretty tall baby (90% height, 75% weight). The seat may travel on the plane at times, but I am not sure which one to get? I've read a zillion similar posts, just not comparing these two. Thoughts oh expert IMSNers??
(Sorry this is abbreviated...holding A in one arm, typing with the other)

TIA!!
(Sorry this is abbreviated...holding A in one arm, typing with the other)

TIA!!
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