Unless there is another analog model I'm not aware of, they use different sensing technologies. The digital versions have a wired probe and the analog versions have a bulb on the end of a thin copper tube hard connected to the controller. The tube/bulb can't be replaced if it breaks but is generally cheaper.
FWIW, I use the analog model and wouldn't hesitate to do so again if I wasn't moving the probe much. I'd hate to tweak that little copper tube too many times and snap it off or worse, get a pinhole in it that I didn't know about and ruin a batch because the controller went funky on me.