Not all webmasters are proficient at HTML, and not all webmasters who wish to link to your site would use the anchor text that would be most beneficial to you. Make it easy for webmasters to link to you. Provide code on your site that they can simply copy and paste into their page to link to you. You may want to give several different choices, with varying keyword phrases, for them to choose from. In any case, you have just a bit more control this way. Not all webmasters will choose to use the code you give them, but you stand a much better chance of getting links that help you in the SERPs if you make it easy for them.