And here is where the line gets blurred a bit. I would say keep the technology simply, swords, shields and bows/arrows, but... with the way Equestria is portrayed, magic can be a powerful weapon in it's own right. I supposed a sword made entirely of pure magic would work, as well as a shield, and even flinging arrows, but that is just for the unicorn and alicorn races.
Even the pegasi ponies have control of the weather, and that alone is a true fighting force.