Belgium - Kondaa
France - Toutatis
Italy - Ortobrucco Tour
Netherlands - Untamed
USA (Florida) - Mine Blower
One of these things is not like the others... Haha needless to say I visited Italy before I started riding coasters, so sadly the only cred I have from the country is Ortobrucco Tour, given the only other coasters open at Gardaland at the time were Blue Tornado, Magic Mountain and Sequoia Adventure perhaps Ortobrucco Tour might've still been no 1 even having ridden them all.
Also before anyone asks, Mine Blower was in 2018 and I didn't find it even remotely rough. I assume it deteriorated quite significantly after then given the reports i'm now hearing.
But yeah Kondaa > Ride to Happiness.