Fantasy is the greatest genre to write in. Yes, I know. That is an only an opinion, and therefore subject to debate, but since it is my opinion and I am the one writing this, I will just go with it (feel free to make your case, too). I am not a professional, so you can take this with a grain of salt. I have only recently self-published my first book, but I have played around with many stories. Most of them were very short, and very short lived. So, I am not basing this on loads of book sales, or even a survey of successful authors. I am merely expressing how I feel about it. What other genre can you create whole races of beings, and fabricate whole new realities completely from your imagination.
What about sci-fi, you ask? Well for me, the science part of that term should bind you a little bit more strongly to reality. I know it is not always the case, but I believe beings and places in that genre need to be based (at least somewhat) on known qualities. You can speculate to your hearts desire, but you should still have to conform to what could actually be possible. If not, if you decide to make your aliens with a characteristic that completely defies any sense of reality… well, then you have moved into the realm of fantasy.
This, of course, still leaves near infinite possibilities. I am sure there are countless people who could tear this theory apart, but as I already stated; we are talking about an opinion. In fantasy the only thing that can hold you back is your own imagination. Your characters can be as normal, or as abnormal as you want. As long as you provide a frame of reference, then not even the sky is the limit. If you want your fierce male dragon to sing in a falsetto, while he breathes venomous peanut butter and jelly all over the enemy (and no, this not a character I would put in a book… probably), then go for it. Weird, but it’s fantasy. You can do that. Your worlds can fly in the face of logic or reality. They can have magic and technology at the same time. The hero can be larger than life, or as small as a thimble. Your world can be any time, any place, and anywhere… or none of these as we understand them in the real world. As long as you provide context, everything is possible.
My first book is in a traditional fantasy setting with many recognizable character and scene types, so this sentiment is not so prevalent. However, there are many stories that I have played around with this concept, and if you just let your imagination have free reign, then it can be a lot of fun. Hopefully, I will be able to let some these stories see the light of day in the future. At the end of the day, that is why I am doing this. I enjoy making stuff up, and would like to share with you.