LONDON , England ( CNN ) -- Who 's the greatest driver of all-time ? Michael Schumacher ? Maybe Alain Prost ? Ayrton Senna perhaps ? In an exclusive interview with CNN , three-time Formula One world champion , Jackie Stewart had no hesitation in naming his choice for the greatest driver of all-time . Three-time F1 champion , Jackie Stewart back in his heyday . `` My hero , and the man I most respected and probably still do is Juan Manuel Fangio . '' Stewart told CNN . It 's not misty-eyed nostalgia for a bygone era that persuades `` The Flying Scot , '' as Stewart became known . And it was n't just Fangio 's tally of world titles that convinced Stewart ; it is the manner in which the Argentine legend saw off his rivals . Who do you think is the greatest ? `` Fangio won five world championships almost in a different car every year . He had the dignity , the style and the ability , '' Stewart explained . What 's more , as Stewart points out , Fangio did n't start racing in Formula One until he was 39-years-old , and whether driving a Ferrari , Lancia , Maserati or Mercedes , he kept on winning races . Though Fangio was the greatest , Stewart rated fellow countryman Jim Clark as the best driver he raced against . `` His batting average was very good and he did n't race in too many grands prix . '' Clark -- who was tragically killed racing at Hockenheim in 1968 -- won 25 of his 73 Formula One races . Stewart 's record is comparable , winning 27 from 100 starts . It 's this win to race ratio that really separates the good from the great Stewart believes . `` I 'm on record as saying winning is not enough , it 's easy to win . Most people win . To be successful , like a Fangio or a Jim Clark is more difficult . '' See our photo gallery of Formula One 's greatest drivers » . As much as Stewart admires seven-time champion Michael Schumacher , he 's finds it hard to put the German in the same league as Fangio or Clark . `` Not to take anything away from him [ Schumacher ] , but his car was so dominant and his team had so much in terms of money and resources , '' Stewart said . `` Although he has won more , his batting average is n't as good -- from starts to wins -- as Fangio or Clark . '' Stewart , who retired from Formula One in 1973 , is a great admirer of the current crop of drivers and he singled out Lewis Hamilton and Sebastian Vettel as potential legends of the future . But they have a long way to match Stewart 's record of three Drivers ' Championships , let alone Fangio or Schumacher . Do you agree with Jackie Stewart ? Or do you think that Michael Schumacher is the greatest ? Have we missed anyone you think deserves special mention ? Use the Sound Off box to have you say .
F1 legend Jackie Stewart tells you who he thinks is the sport 's greatest driver . Win to loss ratio is determining factor of championship according to Stewart . McLaren ? Ferrari ? Have your say on who you think the best F1 driver .