I won't have an electronic lock. I have talked to too many locksmiths about the failure rate of electronic locks, and the failure rate is orders of magnitude higher than the mechanical. One office I worked in, a new electronic safe lock failed, the locksmiths came in, and drilled open in the safe in about ten minutes, start, set-up, and open.
I asked them about the failure rate of electronic locks, and it was several a day. There are a lot of businesses in town that have safes to store company confidential information. Coming up with failure rate of mechanical locks stumped the locksmiths, maybe one a month.
I did have an old Government lock fail, and it had plastic parts. Really awful lock.This lock type is something to avoid, the delrin parts wear and fail.
Mechanical locks are easy to install, and I am sure the electronic locks are the same, self contained units with about four mounting screws and one shaft for the knob.
This describes various lock grades:
Mechanical Safe Lock Groups
The 2M has the metal discs and will last basically forever:
Group 2M Mechanical Safe Locks
This is a good quality mechanical lock
A video on installing a mechanical lock
Pink Panther movies cast safe crackers as high status individuals. Well the sort of person you have to worry about is the type who finds a pillow case, fills it with your stuff, and runs in ten minutes. The grab and run type does not have the time to tickle a safe lock open. The next step up are the ones who go to your garage, find the sledge hammer there, and beat the safe open. Which is loud, and takes time, but is mechanically simple. Safes provide a barrier, and give time. It is my opinion the lock that is needed for a home owner ought to be a reliable lock, over all other characteristics, based on the reports of the number of home safes that have to be drilled open because the lock failed.
I have a used Government safe, the Government lock failed, and it cost hundreds to get the thing open.