I upgraded to a Bosch external pump in the early '90's that I got from Conelys Performance Plus. I had it mounted to a plate welded to the passenger side fuel tank strap spacer with an exhaust U-bolt clamp insulated by two layers of large fuel hoses.
It was quieter than the in- tank pump.
I changed back to an in- tank pump because I got tired of the extra fuel hose connecting to the external pump, well that and going bigger.
Now days it seems the plumbing is more streamlined on the external pumps.
I think it boils down to personal preference.