Novice gear question...rear bags

[2thdrglock]

Just starting out with a new Ruger 10/22. Looking at rear bags and such for benchtop, prone, etc. I'm unsure about what type of fill is best. Is it better to have just plain old sand to make it heavy or something like the beads that are easier to adjust and form to the shape you need? I'm probably not understanding much at all, I expect maybe it depends on position, etc? I found these that I like from the advice of a youtuber...
CROSSTAC Tactical Rear Squeeze Bag XXL
Crosstac Tactical Rear Squeeze Bag 8"

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[Pepe-lepew]

If I am shooting from a bench, rear bag with ears.

https://protektormodel.com/collections/rear-bags