when you use wait command, the tool waits for the given 
time and moves on even if the object has not appeared. 
Whereas synchronization point waits until it sees the 
object.

object may appear sooner or later than the given wait time.
If the object appears sooner than it has wait until it 
reaches the given time or if the object appears later than 
the test fails. So it is always a better bet to use 
synchronisation point.