Hyperion... Obviously...
It's a simple matter of ejector vs floater for me though, so perhaps not a fair comparison... 2 very different rides...
Quite the opposite to Howie, I love the second half! love the turnaround, it's my favourite of any out and back, love the banked speed hill following it, the floater hill after and the banked turn into the spaghetti bowl (official term!!!) the sideways moment in the spaghetti bowl is fun (not sure what those elements are called) the only poor bit is the rapid transitions left and right, they could have been a bit more 'Taronesque.' The airtime hill into the water is another strong moment and even the brake run is hilariously good fun and tries to throw you out of your seat...
As good as Shambhala is, and it is great (only just outside top 5 for me.) Apart from the turnaround, it is the same feeling, over and over... Really good sustained floater. It is an incredible feeling, feels like you're flying or weightless for seconds at a time, but I would definitely take ejector and a good mix of different sensations over it any day. It is definitely the 'better looking' ride, with beautiful views down the hillside towards the coast making it 'feel' even higher and more imposing. I think I am the only person (or so it has seemed from things I've read on here) who actually prefers the staggered seating too... Although the restraints and seats are much comfier for me on Hyperion, and the raised seating on the middle seats of Hyperion helps with the ride sensations because your feet can't touch the flooring.
To sum up, Hyperion, because it has sustained floater, ejector and much more besides... Although Shambhala is the best I've ridden at what it specialises in... sustained floater... Both brilliant.