Digital Lock safes will lock you out after 3 tries in a very short period of time. Ask me how i know haha (i did mine accidently). So he is saying if you screw up three times you are 100% out of luck. With the push button style (which isnt digital but mechanical) you can screw up as many times as you want and just have to "reset"' it by turning the lock a little.
Honestly when looking for a safe your best bet is to go to a safe store. Talk to the guys there and they can get you what you need. I had been thinking I'd get a Liberty but went with a Superior Safe Co model instead. Feature wise it was the same as the Liberty model but was 300 bucks cheaper. Biggest difference was external hinges on the Superior vs internal on the liberty. But otheriwse same number of bolts, weight was the same more or less, same gauge steel, same bolt lengths, ect. American Made as well.
And go for a normal dial lock if you plan to have it for a long time. Most of the electronics only have a <5 year warrenty and after that your out of luck. All my rarely viewed documents and guns will be going in the Superior safe. I have a winchester cheap safe with electronic lock that stores commonly accessed items like my carry gun, bedside gun, cash, spare keys, ect. Im in and out of that safe once a day on average so the electronic lock is nice. And if it breaks itll be fun to prybar it apart