Since both “that” and “which” can be used to modify things in a sentence with an adjective clauses, which one is preferred in which situations? I found the following rules on the Internet. I am wondering if there are other rules.

Rules cited from http://www.worldwidewords.org/articles/which.htm

• In clauses that follow impersonal constructions, such as it is, that is preferred: “It was the dog that died”.
• Clauses that refer back to the words anything, nothing, something, or everything have a slight preference for that over which: “Can you think of anything that still has to be done?”
• Clauses that follow a superlative also tend to prefer that: “Thank you for the most superb dinner that I’ve ever eaten”.