I went with a regular old-fashioned combination lock safe.
We had a fire safe at work for all of our data, with an electronic lock, and it failed on me.
Now it wasn't an electronic failure.
What really happened was that someone had closed the door with the bolts out, and they bent the rack that moves all the bolts.
It did not prevent the door from closing and locking but later when I tried to open the door it would not open.
I wasn't hearing the usual click from the electronic lock, so I thought the battery was dead and I changed it.
It did not work.
I got a locksmith out and he drilled a hole in the safe, then tripped the lock with a screwdriver. The safe still didn't open.
Finally he got two enormous pry bars, and just pried the thing open. It was a double steel wall filled with diatomaceous earth, and that s*** went all over. When we got it all apart I found out that the safe had a rack made of diecast alloy supporting all these really Hefty steel bolts.
Anyhow I found that the electronics still worked fine, but the solenoid could not click, because it could not move due to the bent rack.
I forget the brand of that POS safe, but what I later came to find out was that most of the safes on the market have very poor support for the bolts until you get into industrial and Commercial quality safes.
When I bought my fire safe, I bought one that had really good support for the bolts and could not be pried.
Anyhow after that episode with the safe at work I never did trust electronic locks because a mechanical problem with the lock can cause you to think that the electronics have failed when they have not.
I see the same issue affecting the future of electric guns. Like that cheap safe, if you can't slam them around, then they're not worth a damn.