Digital is popular and overall most desireable. Wally's has best price, and best timer. A couple of things to look out for: 1. Keep the receipt. All digital timers are not equal, and can have problems. Buy at Wally's, easy to return, even w/o receipt. 2. Contrary to what I said, all digital of any brand do seem to be equal. I think they all are made by the same Chinese factory. Features will be slightly different, but when you start [rogramming them, voila - they all look the same. 3. The internal filtering is not "equal", I bought one at Home depot and hooked it to a Tom's dosing pump. Every time it triggered the pump (dosing) the timer would reset due to an electrical impulse from the pump. Swapped it. for two others. They all did the same. Would not handle the inductive load of Tom's dosing pump, but worked ok with lights. Returned one, kept one for the lights. I had to buy one from Wally's that - you guessed it - had the identical programming steps, but worked the dosing pump and lights ok. Internally I am sure that they were using the same electronic chip. Any digital timer must be run and watched carefully for a week or two before one trusts it to operate while going away a few days. And even then I am skeptical due to my problem finding one that doesn't reset itself involuntarily. If multi and different daily settings are not required, such as typically lights for example, the mechanical units with the tabs are much more reliable. But of course if one wants to dose for one or two minutes, it cannot be done with a mechanical type. Buyer test carefully. And buyer still beware!