Regarding sealing gaps and cracks in bathrooms, caulking and silicone can be great solutions. Which one is better depends on the particular job and your preferences since they have their own benefits and drawbacks.
Caulk is inexpensive compared to other sealants, easy to apply with a caulk gun, and available in various colors to match the decor. It sets quickly, so you won’t have to wait for it to dry before you can use the shower or tub again.
Silicone has superior flexibility, making it better for filling wider gaps between tiles or around door frames. It also forms a strong seal that won’t crack or shrink with age. This makes it ideal for areas subject to many movements, such as showers and tubs.
It has greater mold resistance than caulk, so it’s perfect if you live in an area with high humidity levels where mold might be an issue.
Both caulking and silicone have their advantages, so it really depends on what job you are trying to do and what materials are available in your area.