I think the Sigma's are the best and easiest to set, I have the 16.12 wired model, very good.
It also has cadence, temperature, timer, countdown. Everything but altitude which is on the 14.12 model, but it doesn't have some of the other features. O ring mounts are FAR better than zip ties. I take mine on and off many times to take off the handlebar etc. Cadence wires are rather clunky, so I left it off. Sigma also has a fabulous website with simulators of all the models.

What you should NOT buy are the Bontrager's. They only show tenths of miles. WTFing use is that on a bicycle???
They are also horrible to setup. Have zip tie mounting.