There are a few factors to consider when choosing a padlock for a self-storage facility:

1.     Durability: Look for a padlock that is made of a durable material, such as hardened steel, to resist tampering and cutting.

2.     Security: Choose a padlock with a high security rating, such as a pick-resistant or drill-resistant design.

3.     Size: Make sure the padlock is the appropriate size for your storage unit's lock hasp.

4.     Ease of use: Consider whether you want a padlock that is keyed or combination-style. Keyed padlocks require a key to open, while combination padlocks can be opened with a combination of numbers or letters.

Overall, it's a good idea to invest in a high-quality padlock to ensure the security of your self-storage facility.

The best lock for a self storage unit depends on a variety of factors, including the security measures in place at the storage facility, the value of the items being stored, and the level of security you want to achieve. Here are a few types of locks that are commonly used for self storage units:

1.     Padlocks: These are simple, low-cost locks that can be easily opened with a key or a combination. They are not very secure, but may be sufficient for low-value items or storage units with additional security measures in place.

2.     Disc locks: These locks have a circular disc-shaped body that fits inside the shackle of a padlock. They are more resistant to tampering and cutting than padlocks, and can be opened with a key or combination.

3.     Keyed cylinder locks: These locks have a cylinder that is opened with a key. They are more secure than padlocks, but may be more difficult to open in an emergency.

4.     Combination locks: These locks are opened with a specific combination of numbers. They do not require a key, but may be more difficult to open if you forget the combination.

In general, it is a good idea to choose a lock that is resistant to tampering and cutting, and that is appropriate for the value of the items being stored. It is also a good idea to choose a lock that is easy to open in an emergency, such as a combination lock or a lock with a key override.

The thickness of a lock may be an indicator of its durability and resistance to tampering, but it is not the only factor to consider when choosing a lock for a self storage unit. There are other features that can affect a lock's security, such as the type of lock mechanism, the materials used in construction, and the overall design of the lock.

For example, a thick padlock made of low-quality metal may not be as secure as a thin lock made of high-quality, hardened steel. Similarly, a lock with a simple, easily-picked mechanism may not be as secure as a lock with a more complex mechanism that is resistant to tampering.

In general, it is a good idea to choose a lock that is made of high-quality materials and has a secure lock mechanism, rather than simply choosing the thickest lock available. It is also a good idea to consider the security measures in place at the storage facility, such as surveillance cameras and on-site security personnel, and choose a lock that is appropriate for the level of security you want to achieve.