The phrase "arguably leading" is correct and usable in written English.
It can be used when discussing a subject or individual that is considered to be at the forefront or most prominent in a particular field or context, while acknowledging that this status may be subject to debate.
Example: "The company is arguably leading the market in innovative technology solutions."
Alternatives: "potentially at the forefront" or "possibly the top contender."
If there is such a thing as an African version of California's Silicon Valley, the country that is arguably leading the race to the future is Kenya.
Arguably leading the pack of the crop of new British-Asian comics, Yusuf (who is African by birth) had a successful Edinburgh Fringe debut last year, where he was nominated for the Best Newcomer Comedy Award and has now had a pilot for his own show greenlit by BBC3.
Home security was one of the first areas to benefit from the rise of the smart home, and Ring is arguably leading the pack when it comes to smart doorbells.
As of October 11th, across 267 Clinton statements, Politifact rates 51% as true or mostly true, and 12% as false or "pants on fire". The corresponding figures for Trump, across 287 statements, are nearly the mirror opposite: 16% true or mostly true compared with 52% false or "pants on fire". Other examples abound of the balance norm arguably leading journalists astray in 2016.
This inevitably adds a 'biomedical' slant to most global health practice, arguably leading to inappropriate interventions and repeated policy failure.
Tradition is recognized as the hardest thing to change, and the recent and now numerous transfusion studies in seriously injured patients are arguably leading the way in a wholesale revolution in transfusion medicine.
Mike Woodford, arguably our leading macroeconomic theorist.
New Haven at one time was arguably the leading manufacturing city for horse drawn carriages.
UC Berkeley is arguably the leading US university in the areas of computer security, privacy, and cyber critical infrastructure protection.
Part-funded by the Swiss government, the SLF is arguably the leading snow science institute in the world.
Interested to hear that UCB is arguably the leading US university in "cyber" (a word that should be outlaws BTW) critical infrastructure.
