20 series drills (like the 2020P) used a simple seed plate that has to be matched to specific seed size for singulation. I never tried them. The newer 25 series drills used a Kinze pickup unit with 6 fingers instead of original 12 fingers. These seem to do good. The latest series (i don't know the number) uses an air pressure plate, not vacuum, for seed singulation. These still had 2 plates for corn - large & small seed sizes. They looked like they would do a good job?
The great plains row units are built tough, durable, & heavy. The 20 series have a narrow seed tube, the 25 series have a wider seed tube, & I don't know if they changed the newer series' units. The Keeton seed firmers for these units are well worth the money. I have also found that a no-til coulter is not necessary as these units furrow discs when adjusted properly will no-til just fine. Each row unit has 2 adjustable down pressure springs that do an excellent job. Row residue managers might be useful depending on your practice.
If you have the right seed meters they are excellent planter units. I don't know much about their bulk seed delivery system - never used it.
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