Well then in 2 1/2 years has anyone decided which system gets more yield?
It's a personal preference.
One method is low cost, the other is high cost.
There is no 'one best method', it's all about what you're after.
I haven't read the entire thread so I don't know which methods have been discussed throughout, but dry ice kief is easy and gives a good result.
If you can afford a machine, and have a large amount of plant material, the efficiency will most likely be worth it.
Again, personal preference.