There really isn't a correct answer for questions like these, as there are simply too many potential variables to consider.
The right answer for one game is the wrong answer for another. It's not a matter of X being true, or Y being false.
The number of enemies, the number of party members, the equipment the character will have access to, your intended level of difficulty, how much you intend for your player characters & enemies to be able to use their respective skills, the nature of the skills you intend for your characters to have, the manner of their resource recovery, the number of battles they would be expected to undertake in any beginning quest, etcetera, etcetera; all of these things will impact what is the ideal balance for your game.