v2.0 is a typically trained style LoRA, which has a softer style and
doesn't alter prompt understanding, ideal for flexible use and mixing
with other style LoRAs.
(v2.0 is what most people will want to use)

v1.0
is an intentionally "overtrained" model that aims to capture that style
as strongly as possible, at the expense of prompt sensitivity. As a
result, with v1.0 you'll need to experiment with prompt weights, e.g.
(character name:1.3).
(v1.0 was also an experimental proof of concept, so the quality of the dataset wasn't perfect.)