Which ISP provides the best hardware for UFB? In most cases they just use their existing ADSL routers, but for UFB ADSL performance is irrelevant, the “extra” features are the differentiating points. E.g. The snap and orcon boxes have DECT for wireless (landline!) phones
Plans and pricing can change so here I am only considering the hardware, however information on some of the hardware is hard to get (except for snap).
IMO choosing which ISP to go with based on the hardware they give out isn't the best way to go about it. If you want to make sure your router performs well, buy your own. Choose which ISP to go with based on which plan suits your needs best.