On our side of the pond its mainly between the MD902 and Eurocopter EC135. There is not much betweeen them, although I fly the 902 and it is a delight to fly being smooth and quiet.
There are still some operators of the Eurocopter AS355 Twin Squirrel but that is now a little long in the tooth.
I would imagine that there will be some replies extolling the virtues of both.
Good luck