The phrase "a more capable one" is correct and usable in written English.
It can be used when comparing the abilities or qualities of different subjects, indicating that one is superior in capability.
Example: "In our search for a new team member, we are looking for a more capable one who can handle complex projects."
Alternatives: "a more skilled individual" or "a more proficient candidate."
New research shows that when people need help getting a job done, they'll choose a congenial colleague over a more capable one.
The 27-year old will provide a physical threat up front – and a more capable one than Leonardo Ulloa – but the main priority should have been adding more protection for the back four.
This may seem an odd way to view what you're going through but it is certainly a more capable one, that allows you to actively seek solutions.
Lancaster, for example, anticipated that his system could undermine motivation for older, less capable children who found themselves grouped with younger, more capable ones.
In short, while its customers have been recovering from the slump, they have also been replacing burnt-out bulbs with more expensive, more capable ones.
Parliamentary elections today are expected to strengthen the hand of opposition politicians, possibly thrusting some of the more capable ones toward greater national leadership.
Rather than rushing out the next-gen, however, the company has introduced a more capable version of the One.
The opportunity created by the IP intersection of our physical world of smartphones, sensors and wearables with cloud capabilities, intelligence and real-time communications applications is evolving to reveal a more productive and more capable enterprise, one that finally unifies disparate platforms, applications and processes.
But in the closed world of the Mac you can't buy a lighter, more capable laptop even though this one is hardly a sylph.
In fact, the emergence of an ever more capable Iran, not a transformed one, is likely to be one of the main challenges confronting the Middle East, if not the world, in the coming years.
Internationally led efforts to replace the unwieldy and costly constitutional structure of Bosnia and Herzegovina with a more functional one, capable of integrating into the European Union, have been opposed by the country's nationalist leaders.
