Idk if this is on this topic or not. But kind of how you have organized and unorganized version. I think (haven’t seen any literature on this) serial killers should have classifications based on how they hunt. Like do they actively stalk (like how you see in movies portrayal), do they set traps (on the internet or baiting someone), do they camouflage themselves (like hang out at a bar and take someone home), have a partner/disciple/underling, whether they travel a distance or hunt close to home. Or maybe it’s just a further classification on an organized or mixed type.
I think there's a combination of organized plus opportunity, but not necessarily a method for choosing a victim ... all a layman's opinion ...
Organized in the sense that serial killers first fantasize about the murder. Sometimes the fantasy requires tools, like Bundy's fake cast and crutches. Dennis Rader fantasized and prepared a bag of tools, which was discovered by investigators on the top shelf of the front door closet at his home. Each murder results in more organization. In Dennis Radar's case, some victims were murdered at home, others were taken to a secondary location after the initial attack in their home.
Opportunity is a bit misleading, because it isn't just opportunity that results in a serial killer choosing a victim. The serial killer's circumstances have to be in place first, then they search for a victim. For example, they need a few hours where no one will be looking for them.
Stalking seems to be more common in early murders, less common later. Bundy's first victim, for example, was a sleeping victim who was alone. He must have known that she was alone beforehand. He later abducted two women from a beach party, so no stalking, but amply opportunity. After a couple of arrests and escapes, he returned to his original scenario, which was attacking young women asleep at home (or university residence).
Russell Williams was organized with a plan that he repeated. He had a bag of tools for murder. He stalked a woman, entered her home to learn more about her lifestyle, knew her schedule. On a later date, he hid in her home when she was away, then attacked her as she was preparing for bed. He tormented his victims for hours. His final murder was an escalation where he removed the victim from her home and took her to a secondary location (his Summer home).
Williams and Rader have this in common - wanting to spend more uninterrupted time with the victim at a secondary location. Bundy did that as well. All three serial killers attacked women at their homes, all three took their victims to another location.
Can serial killers be separated into classifications of method for choosing a victim? I don't think so. Although some serial killers are repetitive in their method, others deviate from the plan. Bundy, for example, used various methods to choose a victim (at home, at school, beach party, shopping centre).
Hitchhiking or jogging/biking on a rural road seems common because victims are already isolated and vulnerable. In that case, there is a specific method for choosing a victim. For example, Highway of Tears in BC, Canada relates to young women hitchhiking or cycling on a stretch of highway that was used by murderous transient workers heading North. One suspect in several murders (from the US) was deceased when identified. Victims were young girls of no specific nationality or heritage. There is a higher number of Indigenous girls and young women due to hitchhiking.
... just some thoughts/observations