Rat Shack SPL meter: Analog or Digital?

I decided to buy a Rat Shack SPL meter (to test the frecuency response of my speakers and subwoofer) but I'm not sure which one, the analog or the digital? Robert Harley suggests in his book to buy the analog one but he does not explain why. Is there any reason to choose the analog one over the digital one? or it does not matter?
Thank you for any input.