For those of us lucky enough to have had a go, military fast-jet takes some beating. I know hours are sparce at the minute which might take the shine off it but theres nothing better than 100ft (Operational Low Flying height) in the Scottish Highlands at 450kts as you turn around Eilean Donan Castle (of Highlander fame).
Im looking forward to having a go at an Airbus/Boeing cockpit so ill compare it to that when I get the chance!