I bought 1.5 mm thick reference picks for my guitar, and I was very disappointed ... The attack is non-existent and ca balance a tad too serious for this attack said ...
But on the low changes everything, it's really low mediator par excellence! A smooth attack, and the grainy texture of the pick can not drag on too huge wound strings of the bass!

But I prefer bass with the fingers ^ ^

So I put 8, as objectively as possible for me because subjectively, I do not like the guitar to plectrum which is my instrument prédiliction ^ ^