Which one can be better?

Dear colleagues,

First of all I want to excuse me about my poor English. I will try to explain
myself as well as possible.

I want to build a system to mesure the acceleration of the squats (fitness
exercise) which is a lineal movement.

What type of accelerometer of your family could be better for my applicattion?
I had been thinking between ADXL326 (analog) or ADXL345 (digital). Maybe another one?

Which is the main difference between an analog accelerometer and a digital one?

Thanks in advance.