Tip 1: Use the word robust. And use it often. Every 5th time you use the word robust, be sure to combine it with the word "scalable". e.g. "Our vendors offer robust, and scalable solutions to the enterprise-level CMS markets."
Tip 2: Speaking of which, also use the words vendor, and end-user. Make it a point to distinguish the two as often as possible. e.g. "Well, the latest release of bloatus 5.6 offers a variety of features, and improvements that both vendors, and end-users will welcome."
By making such distinctions, you will prove to your audience that you understand the business-side of content management. Open source communists emphasize API's, collective intelligence, the ingenuity of people working under tight resources, and the human desire to create meaning out of being a part of something larger than themselves. Intelligent, business-minded people know that such fairy tales are hogwash. Quality, business driven, CMS solutions have proven robustness, and scalability that Drupal can't match. Let