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Even some Pros never get a hole in one during their whole career!Statistically it surely has to be a hole in one.
Top snooker players are surely going to make more 147’s and dart players 9 dart check-outs than top golfers are holes in one.
The original question was about difficulty, not statistics
Nobody can agree when comparing different eras of the same sport so trying to agree on an aspect of different sports, like this question, is on a slippery slope to oblivion
And as such should be avoided at all costs...
And, for what it's worth, I agree with Fundy...
For the pros I would say hole in one, 147 in snooker I would hazard a guess that most pros have had one.
Remember watching a pro hitting 500 balls trying to get a hole in one and he never managed it.
For the rest of us 147 in snooker would be the most difficult must be very rare that any amateur has had a 147 , where as any hacker could fluke a hole in one.