I don't really think there is much of a difference. Everyone is a rear bag squeezer, and with common bags being very adaptable to how high they are depending on how you orient them, a sloped bag rider really isn't that necessary.
We aren't looking at F-class/benchrest levels of precision here, you don't the need or have time to worry about getting the perfect rear bag conditions. Get your wobble zone steady and send it.
Like singe or two stage triggers, it's just personal preference. I've seen plenty of both on the firing line.