The travel powers in Champions Online are, for the most part, done very well and really make you feel super. You could probably categorize them like this:
Basic Flying - flight, fire flight, teleport
Flying with Bad Maneuverability - ice slide, hover disk, earth flight, jet boots
Ground Travel - super speed, acrobatics, tunneling
Jumping - Superjump, acrobatics, swinging
There is not really a best or a worst travel power. They are highly affected by your own personal preference and character concepts. Test them all out in the PowerHouse, and try different ones on different characters. You will probably enjoy most of them throughout your time in Champions Online.
Please share your opinions of the different travel powers in our comments here.