I like the plane old wired bike computers that were common about 10 years ago. Time of travel, distance, average speed, total distance odometer. The better ones have a more robust wire that is harder to break. Sports Instruments (now defunct) made a really nice SI90 that would go for years on the same battery, the only thing I did not like about it is that you can't enter a number for odometer at battery change time.

I use a separate heart rate monitor. And when I need a map to know where I am going I take a separate 10 plus year old GPS with a black and white display that uses AA batteries.

For my latest bike I got a wireless computer with cadence, burns thru batteries faster and it uses three of them, I sometimes forget to start it whereas the wired ones know when the wheel starts turning, seems to be less accurate than the wired one, etc. I am starting to wonder if I should put an old wired one on instead.