Where should I build my base?

I already crafted the Radiation Suit, Seaglider, High Capacity O2 Tank and all the other basic items, and I have all the fragments for the Mobile Vehicle Bay, Seamoth, Laser Cutter, Bioreactor and Scanner room (and I have the blueprint for the purple tablet).

Most people say that you should build it at the Safe Shallows but the safe shallows is already not so useful for me anymore and now im mostly getting items from the red grass area.