The sharpening in Develop is not related to web use, but is about correcting the softness of the raw file. Apply it on that basis.
You then apply export sharpening. One key for web use is to export images at exactly the dimensions at which they will be used on the web, and apply LR export sharpening. This means you can review the JPEGs and see exactly how the sharpening affects them. However, how they will be used on the web can vary and some web applications will apply sharpening, in which case you might not even want to sharpen in export. You may want to explain a bit more detail about what you're doing - eg building a static web site or uploading full res images which will be resized by the server.