Thread: Do I need a driveshaft loop?

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It's strictly a street car, don't plan on any racing.
Is there any advantage of a tubular loop as opposed to one made of flat stock other than the tubular loop (even though it's bolted in) would "look" more like the rest of the crossmember as opposed to the bolt in flat stock types that are available from the different suppliers?
When I talk of a tubular loop that is bolted in, I'm picturing something that's fabricated from the same OD tubing as the crossmember that I'd fabricate mounting brackets that bolt to the rear uprights on the existing crossmember, kind of like I show in this crappy drawing below