Faster query between OR and IN

Definitely with OR the query will run faster but only if you have few values in WHERE condition.
if you have a set of values then don't hesitate to use IN clause cause it will make your query simpler and won't take extra time to filter the result for the value set.

IN clause:
The SQL IN clause allows you to specify discrete values in your SQL WHERE search criteria.

OR clause:
The OR operator displays a record if either the first condition or the second condition is true.

 ex: SELECT some_x,some_y,some_z FROM some_table
                WHERE Name='some_name1' OR Name='some_name2'

In clause is faster than OR clause...bacause OR clause returns the value after checking two conditions, where as in In clause it checks a column with some values..like

Ex: select something from some_table where some_column IN (some_value1, some_value2);

i hope it help you......