Man I went through that, just got mine a couple of weeks ago. I bought a Liberty Fatboy Jr from Gander Mtn. I love it even though there's no way you'll ever get 48 guns in it. Made in the USA (yeah that was important to me) and a lifetime transferable guarantee where they pay the freight to replace it if there's ever a problem including replacing it when it does it's job protecting your valuables in a fire/theft. 12 locking bolts in the door and a 45 minute burn rating at 1200 degrees. Weighs in right around 700lbs and it's not fun to move but 3 strong men can manage it with the help of some 1" PVC to roll it on.I'm not sure I'd be all that comfortable with a set of keys floating around...seems it would defeat the purpose of having an electronic key pad. Why a key pad when you have a key????
I'm (if you haven't guessed) knee deep in researching gun safes. I'm being thorough because it's a lot of money to spend and it's going to be around a while.
As you can tell...I really question the value of having an electronic key pad. From a preppers perspective, EMP aside, it also means that I would have to be tied to a power source (batteries), which isn't a deal breaker. Yet having batteries around because they are nice to have is a lot different than having them around because they are a necessity.
Or...when the key pad could no longer be powered I could simply use the key...lol
I think the mechanical dial will get the nod...
I work on bank equipment. I deal a lot with combo locks mech, and electronic. Electronic locks do have a slightly higher failure rate that mech locks, because of this you will NEVER see a electronic lock installed on a vault door. The cost to core drill a vault is just way to high. With all that being said, I love electronic locks, that are relatively trouble free, and for the ease of use.Cannon Safe Co just came out with their new EMP safe lock. Dual Access EMP Lock | Cannon Safe it features an electronic key pad for quick access and a built in dial lock as a backup in case of an EMP. Looks like it would be a good idea but it's probably pretty expensive. I don't know if it's available as an upgrade for existing safes or if it's only available on new safes.
Edited to add: My Liberty Fatboy Jr came with a dial lock which was part of the reason I chose it. An EMP was not my first concern, I think the dial will hold up better in a fire also although I have no proof of that. It does not allow for quick access but has a day lock built into it in case you want to keep the safe unlocked while your home.