Hi Noelito
It depends completely on bass sound and set-up and I have tried a ton of different strings.
I currently use a mix of Flexocore (top three) and Pirastro Permenant (extended E) for my orchestral bass. Pirastro Flat Chromes for my solo bass(also regularly re-tuned as my wife's orchestra bass) and Spirocore Weichs for my jazz bass. I pray I never have to replace all at the same time!!
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