The best lock I've encountered so far is the Bolt hitch pin lock. It uses the key from your tow vehicle. I used to use a Reese hitch pin lock myself, but the Bolt is so much easier to work with (i.e. one fewer key to use) that I use that.
I know the OP isn't buying a lock, but I always buy one grade above the average. For example, if the average is a disk lock, I buy an Abus style with the dimple key or the Abloy style wafer tumbler, for bump resistance.
For a trailer, I've found that most trailer hitch locks are a deterrence at best. I use a long shackle padlock on my BAL X-Chocks, and due to a recommendation here, I have a Brinks "J" wheel lock set on my travel trailer with disc locks keyed alike. Yes, the trailer can be made to move, but it will take a cordless grinder and plenty of time. The only step up in security would be putting the TT on blocks or importing "locking winter wheels" from the UK, and storing the rims/tires elsewhere.
As for locks, one brand can have various qualities of locks. For example, Master has some locks which used to be shimmed by a piece of a Coke can. Other lock models by Master use ball bearings, and can't be shimmed.