I want to know your opinions about these manga.
For some reasons that I can't explain,
people who read rave master before fairytail prefers RM to FT but those who read FT before knowing RM, prefers FT.

I'm part of the people who prefers Rave master.
(I do like FT don't get me wrong)
My question is why they (Fairytail lovers) don't like Rave master?

The same can be asked about Rave master lovers. Why they don't like fairy tail? I'm sure there are people who go outside of the box you've set around their fan base, but in the end it all comes down to preference.

As for my personal opinion:
I've never read Rave master before, but I don't like fairy tails.