The Reference is right in the middle of the Times atlas range: it’s inexpensive (£30 list, compared to £150 for the Comprehensive, £90 for the Concise and £50 for the Universal) and presumably a bit less unwieldy. The Mini, on the other hand, is positively dainty: at 15.1 × 10.6 cm, it’s smaller than a mass-market paperback! (Obviously the covers above are not to scale; see the somewhat-out-of-date comparison chart for the various atlas sizes.)
The 13th edition of the The Times Concise Atlas of the World came out last week. The HarperCollins listing sets out the updates and changes from the previous edition (including changing “Czech Republic” to “Czechia,” argh). The Concise is the second-largest of the Times world atlases and slots between the Comprehensive and the Universal in terms of physical size, page count, number of maps and place names. Here’s a handy chart showing the differences between the various Times atlases. [Collins Maps]
Related: Map Books of 2016.