I have a bit of a collection, mainly Generation, but with two Clarkes and a Soodlums. The type of music I am playing at the time alters my choice. I like the Generation Bb for slow airs and some gentle ballady type songs, the Generation D for reels, jigs etc, and the pair of battered looking C Clarkes are for breathy mood type backing or songs that need an air of mystery about them. The little Generations, F and G are loud strident little buggers to play and I don't use them much. The Soodlum has a big sort of presence, almost a straight workman like tone and I use it to play marches and the like. I have an Eb Generation also, very sweet, but unless the group can do that key, it plays solo.
My vote for consistancy and value for money- Generation, the ones with the blue mouthpiece.