Thermoquad float selection help

This bad boy from a 74 360 engine HD truck, which means that it was exempt from passenger car emission standards same with motor homes and industrial engines

It's getting a through reconditioning, and the modifications , some Ive known for a while, one new one here that blew my mind, going to up to a .130 needle and seat
Another member is running a .120 seat at 9 psi, which markedly increased his power markedly

These are floats from 7 different TQ's
They look pretty uniform to me

What are the pros and cons for brass floats vs nitrophyll
In the past years I've seen plenty of "new" brass floats I wouldn't think about using

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