I use all variations, depending on my level of medication. HA! Seriously, all have advantages. Tying each end with its own line makes a nice "V" to pass my hammock support through without rubbing lines. I know you can do the same with CRL, but his is just one of the considerations I use. CRL's make it easy to center ( or off-center if that is what you want) the tarp. I like havinig options and they make set up fun.
“Between every two pines is a doorway to a new world.”
― John Muir
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"With your eyes closed you can't tell the difference between Tyvek and Cuben." - Knotty