Oh, I'm glad you asked!

I will try to answer. In R & S English, the
emphasis in writing is on organization and clear writing, rather than on creativity, while in "Write with the Best", the emphasis is on creative writing. They each teach different types of skills.
Here is a description of R & S English 4...
The first two chapters deal with understanding sentence structure and types. Chapters 3-8 and Chapter 10 focus on seven parts of speech--nouns, verbs, pronouns, adjectives, adverbs, prepositions, and conjunctions. Chapter 9 teaches concepts about punctuation. Chapter 11 concludes the course with lessons on capitalization, the dictionary, synonyms, antonyms, and homonyms. Interspersed thoughout the book are 33 composition lessons. Continual review is built into the lessons.
Here are some of the composition skills that are taught in R & S English 4...
6. Learning to Observe and Listen
12. The Paragraph
13. Speaking Clearly
25. Writing Sentences of Different Lengths
34. Topic Sentences and Titles
35. Unity and Order
40. Developing Paragraphs by Giving Examples
55. Taking Notes for a Report
61. Writing a Book Report
62. Choral Reading
68. Writing a Story From a Picture
74. The Parts and Form of a Friendly Letter
75. Addressing an Envelope
80. Giving an Oral Book Report
84. Writing a Story
85. What to Write in a Friendly Letter
89. Telling How to Do Something
93. Rhyme in Poetry
98. Telling a Story
101. Making Introductions
105. Conversation in Stories
106. Descriptive Words in Poetry
111. Dividing a Longer Story Into Paragraphs
116. Writing a Story From a Poem
120. Writing a Story About a Personal Experience
121. Using the Telephone
125. Being Clear and Specific
126. Bible Poetry
Here is a link to "Write with the Best"...
http://www.heartofdakota.com/hearts-for ... e-the-best
I think it would be tough to find something to replace all of those skills, but you know the alternate grammar program you are considering better than me. I hope this helps answer what different LA skills R & S English and Write with the Best cover!
In Christ,
Julie