Answer may be:

Ideally, Yoga should be practiced early in the morning with an empty stomach but everyone has a different lifestyle so you can practice whenever you want according to your own convenience.

Both have their own pros and cons. Considering the same, you can decide when you want to practice it.

The pros of morning yoga

• Good to kick start your day before you enter a chaotic day.
• Gives a Boost to your metabolism.
• It helps in connecting with your soul.

The pros of evening yoga:

• Helps you to unwind after a hectic day.
• Good for your digestive system.

So the bottom line is:

It is up to you to choose when you want to practice yoga. Whenever you choose to do it, remember to keep your mind calm and relaxed. The only time when one should avoid doing yoga is immediately after meals. Rest for at least two hours after having food.  Any form of exercise right after your meal will disrupt the digestion process.