Before I get into details, I’ll say one thing up front; both are perfectly viable business strategies. They both have checkered pasts with spammy abuse and high quality use. The difference between them comes in infrastructure and setup, as well as how you go about managing the business you create. Neither is inherently better than the other; it comes down to what you want out of the business, what you’re willing to put in, and which system seems more appealing to you.
Focus on reviewing products that fall within your niche. Then, leveraging the rapport you have created with your audience and your stance as an expert, tell your readers why they would benefit from purchasing the product you are promoting. It is especially effective to compare this product to others in the same category. Most importantly, make sure you are generating detailed, articulate content to improve conversions.