Which tools/software do you prefer to deal with in electrical design and load calculations (ECODIAL, SIMARIS DESIGN, E TAP REVIT) ?

Etap is good any many calculation can be done on ETAP,

but load calculation is not  possible on ETAP, we need to first list out all the equipment to find the connected load. Then by applying the diversity factor (depends on type of load, continuous, standby or intermittent) we find the maximum demand load. which is use for transformer selection.

I prefer Etap. Etap has a big vertified liberary for every electrical equipment from diferent manufacturers. You can also select the standard of designing.