With the electric pump, vapor locking is no longer an issue. Depending upon the electric pump being used, noise level could be on the high side. Electric fuel pump location is important for the life of the pump and consistent performance. Pumps need to be mounted close to and at fuel tank level for best performance. How the pump is wired up needs to be considered as it must not be wired to a 'hot' source on a street driven vehicle where the potential is there for it to run when the engine is off (toggle switch control is a no-no). Separate or dedicated wiring to the electric pump is also recommended. Under no circumstance use the positive side of the coil for the fuel pump wiring. As Pete mentions, some kind of inertia switch or oil pressure switch would be a nice safety feature.
Mechanical pumps give good performance when the fuel lines are in good condition and not pulling in any air on the suction side. Engine heat is transmitted into the mechanical pump which can bring to the forefront the aforementioned vapor lock issue but then can be a fuel economy enhancer by having warmer fuel at the carburetor. I’m talking warmer, not boiling here. Mechanical fuel pumps on the Y engines have been trouble free for the most part so there’s no reason to just arbitrarily switch to an electric pump unless addressing another issue.
In the case of where a car sits for long periods of time without being cranked, then an electric pump does give the option of refilling the carb with fuel to facilitate quicker starting.