I tend to think more in terms of projects than 'style'. At any particular time I'm usually working on many different projects.
For example, I currently have open projects on:
Trains, concentrating on engines (locomotives) rather than complete trains.
Lighthouses (not many around here).
Churches (many around here).
Amusement parks and patrons thereof.
If I encounter a good shot that doesn't fall in a current project, I'll still shoot it and file it for future use.
I would never pass up a good shot unless there was a compelling reason to do so, like some dude's shotgun.