The standard comparison in String (and UnicodeString in C/C++) will only do a binary comparison. For display strings, this is almost always incorrect! Wherever the ordering or equality of strings is important to the user, such as when presenting an alphabetized list, then use a Collator instead. Otherwise a German, for example, will find that you don't equate two strings that he thinks are equal.

Of course, if you are comparing strings in a tight loop, you should move the creation of the collator out of the loop! You can also make your collator static to avoid repeated creations.

If a string is going to be compared multiple times, then use a CollationKey instead. This preprocesses the string to handle all of the international issues, and converts it into an internal form that can be compared with a simple binary comparison. This makes multiple comparisons much faster.