Choosing between a velour and a velvet triangle powder puff depends on your specific needs and preferences. Here are some factors to consider:

1. Material: Velour is made from cotton, while velvet is typically made from silk, synthetic fibers, or a blend of both. If you prefer natural materials, you might lean towards a velour puff. However, if you're looking for a more luxurious feel, a velvet puff might be your choice.

2. Texture: Velour has a denser and more plush texture, which can provide a more even and controlled application of powder. On the other hand, velvet has a smoother and softer texture, which can give a lighter and more diffused application.

3. Absorbency: Velour is more absorbent than velvet. This means that a velour puff can pick up more product and distribute it more evenly on the skin. However, this also means that a velour puff might absorb more product than necessary, which can lead to waste. A velvet puff, being less absorbent, can provide a more sheer and natural finish.

4. Cleanliness: Both materials can be cleaned easily, but due to its higher absorbency, a velour puff might require more frequent cleaning to prevent buildup of product and bacteria.

5. Durability: Velvet is generally more durable than velour. If you're looking for a puff that can withstand frequent use and washing, a velvet puff might be a better choice.

In conclusion, if you prefer a more controlled and even application of powder, and don't mind frequent cleaning, a velour puff might be the right choice for you. However, if you prefer a more sheer and natural finish, and want a puff that is more durable, a velvet puff might be more suitable. It's all about finding the right balance that works for your skin and your makeup routine.