Ans : from
the usage rule is : use "from" when comparing two nouns/objects and use "than" when comparing a clause.
also, when in doubt use "from" because it is generally more accepted.
this usage rule is similar to that of "as" and "like". "as" is used for clause, "like" for objects while enumerating examples.
i am sorry that i cant give any examples off the top of my head but the rule is correct.
It matters not how strait the gate,
How charged with punishments the scroll,
I am the master of my fate :
I am the captain of my soul.
~ William Ernest Henley