In the opinion of a kinda-retired player, I think this debate is equivalent to Flamethrower X Fire Blast (accuracy x power) which is common in Pokémon. What's the solution in this case? Player's preference. It's the same thing here; there are people who prefer full speed and offense, and will go for Energy Returner and lots of energies, while other people would rather use Delcatty to get a more consistent damage output, even though this requires measures to get Delcatty in play and so on. Each has its pros and cons, but I don't think one is necessarily superior to the other. It depends on who's using it.