A good safe... key, key combination or finger print?

[Otispunkmeyer]

I need to get a new safe as we've now outgrown our little passport safe (and the MiL turned up the other day as she's moving house and no longer wants to look after my wife's "treasure" and so now I have some very very expensive items to keep somewhere).

So I was thinking of something bigger but also a little more robust. I've seen stuff like this:

Example of decent looking safe

But wondered if they're actually any good. The main options seem to be key (can lose it). Key combination (no problem remembering it). Finger print (don't have to remember anything but not sure how secure).

I know ultimately if someone does break in and they want the contents then they'll get them. But a decent "hotel safe" secured to a wall would probably deter most opportunists.