My opinion is Jack was better, some reasons,
The equipment in his day hardly matches the titanium drivers and balls of today and for years Tiger and others played the same length courses, wasn't until only a few years back did they lengthen the courses to meet the latest equipment advancements, all these "new " guys had many years to use the latest equipment to catch-up on the old guys, and even still look at how many old guys collected majors:
Jack Nicklaus - 18
Walter Hagen - 11
Ben Hogan - 9
Gary Player - 9
Tom Watson - 8
Bobby Jones - 7
Arnold Palmer - 7
Gene Sarazen - 7
Sam Snead - 7
Can't name any other player today that has Major Victories anywhere close to these great golfers.
Bobby Jones who stopped all golf at the age of 28! What would have happen if
Jack also only for two weeks at a time, then home with family....
He didn't push to collect as many Majors as humanly possible, he wasn't given a golf club at the age of 3 and from then on golf was all he did, with training what ever the most money would buy.
Adding a couple of hundred yards to the Augusta will never make up for the new balls and clubs of today,
Personal Trainers, massages, psychic professionals that follow their golf Pro around from match to match, they should win every week!
To me JACK is the MAN!
phil