Both

 "Are you a mech or a femme?" Waverod hated that question for several reasons. What did it even matter? There was no significant aspect of Cybertronian culture that hinged on the difference. It's just a different way to process information; it rarely mattered in terms of biology, let alone functions, skills, or allegiance.

"Are you a mech or a femme?" These terms weren't used in the most ancient datatracks. Before contact with organic planets, there weren't really even words for the concepts. The closest you could come was something like "One who processes information in the minority way" for femme, and "One who processes information in the majority way" for mech. Even those phrases were only used incidentally, when needed to explain how someone came to a conclusion. The pre-contact Covenant of Primus uses the first of these phrases maybe five times (four times referring to Solus Prime), and the latter once.

"Are you a mech or a femme?" Of course, organics divided themselves like this. Many species seemed to have various genders; variations on two main ones were common, with humans being a particularly tricky example. The roots of gender divisions always seem to lie in procreation; different sexes take on different roles in the actual act, and then culture builds roles on top of this foundation. But Cybertronians don't reproduce that way. So why would the distinction matter?

"Are you a mech or a femme?" Yet this bot still wanted to know. Somehow, it still mattered to someone how Waverod processed information, even though the actual information being processed and the conclusions reached were trivial: a few drink orders, some old stories retold among friends, perhaps some games. There weren't any organics here -- there rarely were, and few organics can directly consume Energon.

"Are you a mech or a femme?" There's an intelligent species on a distant planet with a two stage lifecycle. The first stage has three sexes; all three are required for procreation, though recreational sex can involve fewer. The triple continues to procreate until, in their last act of sex, they interpenetrate to the point that they actually merge. The result is their second stage. Sex is purely recreational for this stage, and they have no gender distinctions. Waverod wondered what they would make of this question.

"Are you a mech or a femme?" How do you really know which way Solus Prime processed information? All that we know is that it was different from her fellow primes. Supposedly the minority way was the same as her way. But how could anyone be sure of how another processed information? Orion Pax and Megatron had the same information about the problems in Cybertronian society at the start of the Great War. They came to very different conclusions about how to address them. They're both considered mechs.

"Are you a mech or a femme?" Waverod had examined how he (she? they? it?) processed information. It always seemed to be, it depends. The situation mattered. The purpose mattered. The information itself mattered. Sometimes Waverod was more in sympathy with femme thinking, other times mech thinking. But you followed the logic of the thing, and you used your own emotions and experience, and came to a conclusion. Styles could vary, but so could emotions and experience. Perhaps that was the way to answer the question.

"Are you a mech or a femme?" Yes, Waverod had an answer for that bot.

"Both."