Fuel hose AN6 or AN8

I ran a blue Holley pump with 6an from cell to reg to carb on my sb stroker. It worked ok. The pump was so loud I couldn’t stand it! So I got a quick fuel 230 pump and return reg. I run 8an from cell to reg and to carb. Plus quick fuel filters. 10an return to cell. That’s what they recommend. Works great no issues. Pump is 10 times quieter! 410 stroker ported w2’s solid roller, and I street it.