Oslo is really not easy on strollers, nice shoes or smaller dogs compared to flatter, warmer European cities. Hills with gravel, ice and salt in winter is a hazard even without baby. If where you live have steep slopes, you'd appreciate hand brakes. That would suggest three-wheeler joggers. If you live downtown relatively flat areas, never plan to take the stroller beyond Frogner Park, then any four wheeler with descent wheels and suspension will do. This cybex is quite expensive. I have watched videos of @BarnevognverkstedNo praising uppababy vista 2 a lot for sturdiness. Note that big wheels and descent suspension means higher weight. I suspect you can't save money or weight in Nordic conditions. E.g. Thule urban glide is light and works well in Oslo Sentrum, but try taking that thing onto the tram on a daily basis? It's huge even when collapsed. If I need a stroller in Oslo, I'd have to take uppababy ridge for hills and walks in the woods, or uppababy vista or bugaboo for city centre. Plus a lighter one for vacation and public transport, like a nuna triv next.

Fox 5 for Oslo :)