Love leupolds. Clarify, toughness, warranty (and not needing it), weight. Beat the absolute crap out of several in competition and used many more normally.
For plains game only, I'd personally opt for the 2-12 or 3-15. Be very few instances when you want less than 2 or 3x, but IMO many times you would want more than 6x.
1-6 is perfect for DG or combo plains/DG if you only have one scope. The difference between 1x and 2 or 3 with DG could be big in the wrong situation, though that is rare and even more so as a client and not PH.
That being said, I shoot targets out to 600yds on the clock with a 1-6x leupold but the targets are large (probably average 4-6MOA). But I prefer the option for higher magnification when trying to make an ethical shot on game vs just hitting steel