Upvote:3
Bruce Metzger's A Textual Commentary on the Greek New Testament is a well-known book that accomplishes what you asked about.
I'd also recommend procuring some critical apparati. These list the variants and allow the reader to form their own conclusions, for the most part. Two well-known apparati are Nestle-Aland's NA26/ 27/ 28 Greek New Testament, as well as Constantin Tischendorf's critical apparatus.