For WooCommerce, I usually prefer Redis. Memcached is fast and simple, but Redis tends to be the more common recommendation for WordPress object caching now. It works well when the store has many repeated database queries, product filters, and logged-in customer activity.

That said, Redis will not magically fix a slow store if the theme, plugins, or database are messy.

I moved one WooCommerce site from no object cache to Redis, and the admin area felt faster right away. Product editing, order screens, and some filtered pages were smoother. Customers probably noticed less than I did, but the backend improvement was real.

I have used Memcached too, but for WordPress stores I would pick Redis if the host supports it.

In real life, the bigger difference is usually not Redis vs Memcached. It is whether object caching is configured correctly and whether your database is under pressure. A clean WooCommerce store on good hosting may not show a huge difference. A plugin-heavy store with many queries may benefit a lot.

I would test before and after with real pages, not just a homepage speed score.

For a WooCommerce store, I would focus on Redis, good hosting, clean checkout exclusions, and database optimization. Memcached can still be useful, but Redis feels like the safer long-term choice because more WordPress hosts and plugins seem to support it clearly.

Just make sure you are not caching the wrong pages. Object cache helps, but cart and checkout rules still matter.