Gun Cabinets
A gun cabinet is like a gun safe in that it's a place to store guns. Cabinets, however, aren't nearly as secure as safes. Some cabinets simply allow easy access to the guns contained within, while others provide a place to display firearms through a glass window.
Considerations
Manufacturers often include additional features that might not be necessary and can even lower security. For example, hidden hinges typically aren't as sturdy as exposed hinges and only provide aesthetic beauty, having nothing to do with a safe's security.
Size
Safes made of thick steel are typically the most secure. Look for something with at least a 1/2-inch steel door and 1/4-inch steel siding. Generally speaking, the heavier the safe, the more secure it is. Proper security and fire protection are achieved through steel and high-density concrete amalgamate, two heavy substances.
Tips
Gun safes are expensive, consider buying used to save money. Also, consider buying a safe larger than what you currently need if you plan on adding to your gun collection.