Start with the threat you are protecting against. Burglary safes are rated by how long they resist attack (RSC, TL ratings); fire safes are rated by how long contents survive heat. Most home buyers need a bit of both — documents and valuables survive fire, jewelry and cash survive theft.
Size matters more than people expect. Buy one size larger than you think you need; safes fill up. Measure your space, check floor loading for heavy units, and plan the delivery path — Manhattan walk-ups and elevators impose real constraints.
Installation is half the security. An unanchored safe is a convenient carrying case for a burglar. We anchor safes to floors or walls properly, and we service combinations and locks afterward. Buy the safe from a reputable dealer; have a locksmith install and maintain it.