I think this is a good topic and I also wanted to mention that you need to consider the consequences of not tying the boat off properly. I'll admit it, I'm paranoid and for temporary stops and on initial beaching I may do a quick tie off to a sand stake or even a small tamarisk - but for overnight (especially on the grand or other rivers where the flow could changed significantly overnight) I back up the tie-off with another anchor or other boat that may have a totally independent achor as well.
This mostly comes from thinking about the rare but still possible situation where you tie to a questionable anchor or use a questionable knot and your boat decided to continue the trip without you.
In summary - why the anchor pictured below should be reconsidered.
"It's supposed to be hard. If it wasn't hard, everyone would do it. The hard... is what makes it great."