Very difficult to say. Expensive ones from K-rauta might still be crap and cheap set from Jysk might last a decade without issues. So it's pretty much the same than furniture in general, you need to consider look and feel vs price. Wooden ones last way longer if you treat them every now and then (oil or beeswax) and keep them stored away at winter.
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Thanks for the advice, I think I might have to just go around and shake some chairs and tables then, to get a feel for them. Also the tip of putting them in the warm storage over winter I would not have considered but that does make things that fold more attractive. Kiitos!
It doesn't need to be a warm storage, just somewhere that snow and slush can't get and soak the wood. The cold air alone doesn't do damage, but if the furniture is wet when it goes below zero it'll cause problems. And of course when it's really cold plastic parts get brittle and specially if the furniture is used then they might get damaged.
I prefer wood and steel, but there's nuances with those as well. Some cheap "wooden" furniture is made out something more like a sponge, but in the other hand we've used some cheap dining table as a garden table, just get one made with real wood and treat it properly and it'll last quite a few years.
Consider getting them second hand too. Tori.fi is a good place to start looking.