Ferrari's second best racing driver

Sir,

After a superb victory in Monaco, much has been made of Schumacher becoming Ferrari’s most successful driver. I dispute this. He may have the most Ferrari Grand Prix wins (16 to date) but Niki Lauda’s 15 victories brought two world championships and a hat trick of manufacturer’s championships, all in just four seasons. By these criteria, Lauda surely, is still the more successful.

I am, yours, etc. C J Hardy, Seer Green, Buckinghamshire