I use a Sigma 1106 trip computer that just gives me the basic info for my mountain bike
Total odo
Total time
Trip dist (current trip) resettable
Trip time (current trip) resettable
Avg Speed
Max speed
And a Specialized Sport Trip computer on my Road bike which does the same basic stuff
But there are others that can do all the above and MORE
really depends on what you want to track when you ride