I'm not nearly asknowledgeable as some of these guys. Where some of them are rabid crossbow shooters, I just play around with them when the fit takes me.
But I'll tell you what I do know...
Your thinking is pretty much correct. As a general rule, the crossbows with longer power strokes will have slightly better performance. They will take a longer bolt and the longer, the more stable in flight. So they should be more accurate at longer distances.
But you have to keep in mind that crossbows are prettyinefficient, due to their short, heavy limbs and short power strokes. Where a modern, high performance30" draw compound at 70 pounds will deliver around 70 ft lbs of KE, a crossbow will only deliver KE equal to roughly 1/3rd of the prod's draw weight. So, if you need somewhere close to 70 ft lbs of energy, you have to go to a 200 lb draw.
That's as much as I can help you. Don't have the slightest clue which crossbow has the longest power stroke these days.