There aren't that many dissimilar types of Romex but there are a lot of dissimilar awg sizes that it comes in. There are also a lot of dissimilar conductor counts and sometimes the cable will have a bare copper ground wire.
Romex is a brand name created by South Wire Company. They own the Romex name and use it to their benefit by only selling to safe bet distributors. It is made to directly help electrical contractors pull the wire through a home and wire a home much faster.
Romex wire comes in awg sizes fluctuating from 14 awg solid to 2 awg stranded. The unlikeness between solid and stranded is the bare copper inside the insulation. Sometimes it's one wire and insulation compared to 19 wires bundled together to make the awg size needed. Typically the stranded wire is only in the larger awg sizes starting at 8 awg. The 14 awg through 10 awg is always solid in Romex cables.
Each cable comes in a 2 conductor or a 3 conductor with an elective ground wire. The ground wire is never stranded and usually smaller in size than the conductors. The most popular is the Romex 6/3 because it covers the median electrical supply whole to an appliance or hot tub.
Underground wire is very similar but it has a rugged jacket for outdoor use and even conduit and private use. The wires inside the jacket are the same Thhn wires but the jacket covers each wire individually to protect against outdoor weather and impact.
So the only dissimilar types of Romex wire are basically the awg sizes. Ufb cable is in its own type of outdoor and private cables.
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