Dominant in America
PMBOK is well-accepted and popular worldwide, and is without any doubt the dominating project management approach in North America. PMI membership concentrates with 70% in North America. In Asia Pacific, the PMP population is about 35,000, while China has a population of 10,000. PMI entered China in 2000 while APMG’s PRINCE2 only has their ATO (Accredited Training Organization) in 2007. PRINCE2 originates in UK, however, it spreads more evenly globally with over 70% members lies outside the country. In China the PRINCE2 growth rate is at 100% per year, it is anticipated that it will reach 50,000 certification over the next 5 years. 
PRINCE2 is the de-facto standard for the United Kingdom as it is mandatory in all government projects. It also has a strong presence in Europe and Australia, and is expanding its reach on a constant basis as is with PMBOK. Hence, if you want to make a career in the UK as a project manager, then PRINCE2 certification is highly recommended. If your plan is to work in the public sector of UK, then PRINCE2 certification is almost mandatory. For example, if you go through the some of the recruitment advertisement in the UK, you can easily understand that without PRINCE2 certification you probably won’t be considered at all.