I'm a hardcore brony. I love the show and the fandom. I'm reading pony fics, I'm reading fan comics, I save hundreds of pictures. I even have a few pony toys of the curent gen that represent my favorite characters.
HOWEVER, this is the TOYS we are talking about here. As a hardcore brony, it pain me to say that the pony toys usually suck mighty balls. Especially the older gens. I have nearly 1000 Transformers in my collection for a reason. These toys are AWESOME no matter the generation. I dont read TF fictions, official or not. I dont save fannart. I just watch the animated shows and the movies. Still, I discuss Transformers and all my spare cash go to collecting Transformers.
So, my vote will go to Transformers.