If by “best” you mean high-paying + reliable payouts + wide product options, then the choice depends on your niche.

• Amazon Associates – Huge range of products, but commissions are low (1–10%). Works best if you have massive traffic or trust from your audience.
• ClickBank – Digital products with commissions up to 75%. Great for niches like self-help, fitness, or making money online.
• ShareASale – Hundreds of merchants; good for lifestyle, tech, fashion bloggers.
• PartnerStack – Best for SaaS and B2B tools, with recurring commissions that stack monthly.
• CJ Affiliate (Commission Junction) – Strong network with global brands like GoPro, Samsung, etc.
• Impact – Premium advertisers, tracking tools, and high-value campaigns.

A blogger in Lagos I know switched from Amazon to PartnerStack and now earns recurring income promoting one project management tool—every month’s paycheck grows without extra work.

If you want fast cash, go for networks with high-ticket items or recurring payouts. If you want long-term stable income, build around products that people will keep buying for years.