With the vortechs, you can't turn them to suit your needs. They point straight out. I love that the motor on this pump is out of the tank though.
With the tunze streams you can, but they are much larger (well, at least IN the tank). The whole pump is inside the tank.
The nano streams are nice, in my opinion, and I have modded a 6025 to push a whole lot of water out (maybe around 1200 GPH or so) in comparison to what it used to. They can be turned to point wherever you want. Pump is inside the tank and it comes with a magnet to hold it with. I'm happy with it and it's cheaper.
Hydor koralias have gotten popular because they're inexpensive compared to the first two. They're bigger than the nano streams, though. Pump inside and magnet like the nano stream.