Replace an Analog Pot with a digital one?
Based on your question "How to choose", you can see that in the link you provided, there is a table. In that, the most significant parameters you need to check is the voltage and the current. Choose Isupply (max) and Vsupply (max) according to your application.



Little explanation about other parameters:

Channels: number of potentiometers in that device.

Positions: number of steps from min. to max. resistance.

Interface: This is for programming the up/down control. If your using I2C or SPI choose accordingly. You could also choose one with the up/down interface, where you need a clk, control signal and an up/down signal. You could do this using your arduino. Or, push button is the simplest, but you will have to vary it manually.

Also, click on each device to see the block diagram. You'll get a better understanding.