Currently the most common choice for a new kitchen sink is the single bowl undermount.
In the past decade, Solid Surface counter tops, such as Quartz, Granite, and other various stones, have become closely priced compared to laminate tops. When offered an option between a laminate top and a similarly priced solid top like quartz, most people choose the latter.
With a solid surface top you now can use an undermount sink.
Most new Kitchens are designed with using a "sink base cabinet". This can be a corner base ( commonly 30", 36", or 42"), or a linear sink base that measures 24". 27", 30", 33" or 36". Larger and smaller options exists, but they are not common.
With this information, now lets look at the single bowl and double bowl sink options. Single bowl options are available from as narrow as 10" wide, all the way to 57" wide - and larger. However, double bowl sinks generally start around 30" wide, and are common at 32"-33" wide,
Simply stated, More sink options exist for a much larger demand of cabinet sizes.