6* basic pool or 6* Featured pool?

By September I’ll have enough 6* shards for the Featured pool which is 15K shards.....I know all the new champs are getting adding to the basic pool in September. Does everyone think it’s worth spending 15K 6* shards and possibly getting a bad champ still or should I just stick with the basic pool?
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Its not worth spending so much extra shards for a chance at a good hero but risk getting one already available in basic pool.