Good plan, to try out several at the shooting range, before you buy one.
For me, a semi-auto handgun needs to have at least two things, if not 3.
The two things are (1) a double action trigger, and (2) an exposed hammer that I can set to half-cock safety.
The 3rd thing that would be nice is an adjustable rear sight.
The 9mm calibre is fairly popular with women in the semi-auto guns.
Anyone who is not comfortable with a .45 ACP usually does well with a 9mm instead.
Good choice, in calibre.
My first choices would be a Ruger, or a CZ, or a Sig.
These are practically identical guns, with Sig the most expensive, CZ priced in-between, and Ruger All-American.