Re: Ladder test or round robin to find node
"Any thoughts and/or opinions from you guys who've done both would be great. "
Both methods work fine, both done properly will get you to exactly the same place; how quickly you'll get there is largely up to how you do it.
Neither method will give instantly perfect results without further testing (and refining) to confirm your initial findings. And then you'll need to do it again to find the best seating depth.
IMHO, if anyone gets inconsistant results with either system it's more likely due to an erratic shooter than a failing of the testing method.