I am unfamiliar with the Galax models, but the Zotac I am told tends to be a bit loud.
The Vega56 tends to draw more power, is hot, and loud as well.
The 1070Ti will generally outperform the Vega56, though maybe not by a huge amount.
HOWEVER - the important questions are:
1 - What is the manufacturer and model of your PSU?
2 - What is the resolution and refresh rate of your monitor, AND, does it have FreeSync, GSync, or neither?
1. super flower silver eco 600w
2. Currently neither, but thinking of going freesync for an upgrade.