Clyde,
Is Comrie any good?
Just as Niall describes it really, a charming nine-holer in an area full of charming nine-holers. Killin is cool, but I think Strathtay might be my favourite of those.
What about the likes of Glenbervie or Pitreavie to challenge Boat of Garten ? Or even Elgin ? Not as scenic but a better course in my view. Nothing against B of G which is a course I like but struggling to see it a notch above those mentioned.
Niall
There's perhaps a bit of recency bias in my favour towards Boat of Garten, as I've walked it one and half times in the past twelve months, but I value a sense of place and unusual landscape more than most. Plus there's a bunch of interesting stances and testy shots to try out.
There's a batch of interesting courses that would vie for that next bracket down - Blairgowrie (Rosemount), East Renfrewshire, Kilmalcolm, Lanark, Ladybank, Pitlochry, Pitreavie, Scotscraig (?) - but it's probably not worth the energy in trying to distinguish between their qualities and failings.
I've only ever toured Loch Lomond and G West. They don't have the architectural grandeur or sense of adventure to compel more than the Kings, but I think it would be an interesting debate between those and the Queens - one which ultimately would come down to taste, as always.
Downfield is a decent parkland, choked by trees, in my book.