Possibly a slightly easier decision than the other group here, in that I'm eliminating Troy straight away, it's good but has probably gone about as far as it merits.
Taron is the obvious group winner, which leaves a choice between Karnan and Valkyria for 2nd.
Valkyria is, by some distance, the best of the 6-across dive coasters I've done in that it's actually quite good. Karnan meanwhile is completely bonkers but arguably pushes too far beyond the capabilities of the ride vehicles making it a bit of an endurance test. Karnan gets the vote.