Booster seat recommendations?

[Bucharest]

Dd almost 6, am in Italy, so everyone thinks am bonkers for even considering having one but hey, might start a trend..Will probably get one shipped from Amazon...

What does everyone have and why?

(dd will be in car at most once a week to visit outlaws, I don't drive and we walk everywhere, apart from this weekly torture visit.

3 cheap ones I bought in local shops.
One is vinyl covered plastic with arms, one is a hollow plastic shell with small arms, one is cloth-covered styrofoam.
I may well be wrong, but I don't think it matters much what you use, unless you have a ?latch (strap on bottom) on it, then you'd be looking at stuff like expiry dates and 'quality' plastic.