It is better to pray in the time of Fazilat, when the prayers are rewarded with more Thawaab.
By regular offering of Salaat at its fixed timings, the spirit of punctuality is developed.
When the time of a Salaat ends, it becomes Qadha. If you have not prayed your Salaat before it becomes Qadha, you will then pray with the Niyyat of Qadha (rather than 'ada')
THERE ARE SEVERE PUNISHMENTS AND DISADVANTAGES OF DELAYING THE WAJIB SALAAT, MAKING THEM QADHA OR MISSING THEM COMPLETELY.

Exercise: The Time for Salaat:
Simple questions – try and answer without looking at your notes...
What does the time of Fazilat mean?
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When does a Prayer become Qadha, and what do you have to do when it has become Qadha?
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