As you noted, there are "other guides". As an antidote to Strunk & White, I have always liked the Fowler brothers' The King's English (1906):

https://en.wikisource.org/wiki/The_King%27s_English

Just a small sample:

"The 'split' infinitive has taken such hold upon the consciences of journalists that, instead of warning the novice against splitting his infinitives, we must warn him against the curious superstition that the splitting or not splitting makes the difference between a good and a bad writer."