Many toys boast of their length in inches, however, it’s typically the width and girth that makes a toy push your limits. A toy with a lot of length certainly looks big, but you are the one choosing how much of the length you’re using. With a wide girth dildo, your body immediately needs to accommodate the size, unless it is a toy that starts smaller and tapers to a larger size.
Consider what you’re trying to accomplish with the toy you seek! If it’s going to be used anally, make sure it’s anal safe. If you want to target the prostate or G-spot, go with something curved. If you just want the sensation of fullness, think about whether you want a particular texture, versus a smooth shape.