Dual voltage regulated power supply using LM338 and LM317/LM337

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I was wondering if it is better to just use two LM317 instead and connect them in parallel to LM338 instead of in series like it is in the attached schematics?

R5 and R6 values are to be determined. I might add a trim pot to fine tune it.

Any help is appreciated!

sch-v1.PNG