O2
Pick O2 if Priority or a Virgin Media bundle matters, or if giffgaff/Tesco Mobile already look like the SIM you want on those masts.
Pick O2 for: Priority, Virgin Media household, O2 high-street habit.
About O2Compare
O2 vs Vodafone.
Two host networks with similar “mainstream UK” jobs. O2 is the Priority and Virgin Media household. Vodafone is extras-plus-business, and the host for VOXI and Lebara.
Vodafone
Pick Vodafone if you want that shop’s extras, a business path, or an international brand (Lebara) on the same radio.
Pick Vodafone for: Vodafone extras, business SIMs, Vodafone-based international.
About Vodafone