convertible car seat question

hello! so we are in need of buying a convertible car seat soon. I really like the Graco 4 in one (it's actually half off right now- I live in Canada). But a few people told me to get the Graco extend to fit. I've read the comparisons and it seems the only difference is the extra 5 inches of leg room? anyone have either of these and can give me their opinion? I know there are other car seats but we're planning on buying one of these Graco ones, just confused now lol

thanks!!