I would go with a Surge. I have both and like both. The Surge goes furthur and last a lot longer. I have found my flashes beat in and become big flip hyzer disc. But then again if you need that shot in your bag this disc will give it to you eventually. The Flash holds a dead straight line out of the box and is quite nice for a while. They both are good disc...I would still say go with the surge though.
I need both. Hyzer flips and loooong anny's are surge all the way(some surges are stable as heck too). Flash's are awesome for that straight line lazer beam shot. Also if you turn them over a little it will glide real nice pretty straight.