The main difference is how people use them and what they're looking for. Pinterest users are actively searching for ideas, products, and solutions - they're in planning mode, whether it's for home decor, recipes, fashion, or business tools. Instagram is more about entertainment, lifestyle content, and following people or brands you already like. So if your business sells products or services that people research before buying, Pinterest usually converts better because users have buying intent. Instagram works better for building brand awareness and community, especially if your business has strong visual appeal or lifestyle elements.
For getting actual leads and traffic to your website, Pinterest tends to perform better because every pin can link directly to your site and people expect that. Instagram makes it harder with limited link options unless you pay for ads or have a large following for swipe-ups. That said, Instagram is better for building relationships and engagement if you're willing to put in the time with stories, reels, and comments. My advice would be to look at your analytics and see which platform actually drives more quality traffic and conversions, then double down on that one rather than spreading yourself thin on both. If you're selling physical products, home goods, DIY stuff, or anything visual that people plan purchases around, focus on Pinterest. If you're building a personal brand, offering services, or targeting a younger demographic that lives on Instagram, focus there instead.