The reduction ones allow for a quicker start yes? with less power draw?
As I understand it, yes.
As luck would have it, that starter I replaced last November has failed on me. At least the solenoid failed so I ordered a replacement under the warranty. When it arrived I determined just to swat solenoids for an easier job but it turns out both starters must have been from a different production run because the solenoid mounting point didn't quite line up with each other. So I had to swap the whole starter again and found myself struggling to get one of the bolts to bite. My replacement starter has only 1 mount hole that's threaded, that meant a trip to the hardware store for a longer bolt and a nut to secure it.
It's always something.
It seems this replacement, also a reduction starter, has the teeth cut on the gear a little bit less like blender so it doesn't make any grinding noise like the OP in this thread complained about. My flywheel and I are both happy about that.