Surely the triple-triple bingo is either "On" or it isn't, whereas the hole in one is always on.
What I mean is, and I'm guessing here, on the average course there must be about 6 or so greens where a hole in one is a possibility, but in most games of Scrabble, a triple-triple bingo is not.
Usually four or five short holes on a golf course.
Someone opens the outside at some point in scrabble and as long as there is one tile on the outside with the trebles open it's on.
I've had one career triple-treble and no holes-in-one but I've probably played a hundred times as many rounds of golf.
Even my Dad has had a hole in one, Ralph! Get a grip! :-) He’s been playing over 60 years, very regularly so it surprises me he hasn’t had more. I know of terrible golfers that have had double figures and outstanding golfers with only 1 or 2 to their name.
On the scrabble comparison, I’d say the scrabble one is harder due to multiple different factors and variables. Golf presents more regular and consistent opportunities despite other variables - in that every course has at least 3 opportunities, even for the average golfer. What’s more, you can get lucky holes-in-one whereas to get a triple-treble requires a lots of skill and not much luck.
That’s my take anyway being alot more knowledgable on one of the games than the other but reasonably proficient at both.