I like a lot of different styles of games.
My original home-brew is a realistic, low magic, low fantasy, and renaissance era setting where dragons and giants and demons are legendary creatures and technology is about to burst upon the scene in a major way. It isn't particularly dark. It is marked by a stiff struggle between divine casters and arcane casters. It is very human-centric, with all other races playing very minor parts in the plots.
I also run games in the "
Untamed Legends" setting which is fairly dark. It is full of dragons, giants, elemental, and fey. Humans are usually slaves of the more powerful races and are struggling just to survive. Magic is at about average level in that setting.
I also enjoy modern settings and am working on the 1948 setting, which is fairly "dark" and includes plenty of magic, monsters, and sci-fi elements. Basically, the setting explores what history would have been like if things had happened a little differently during WWII.
I also like high magic settings and my home-brew has a particular period in its history where magic is very strong. I hope to run a game in that time period later this summer. The PCs will be loaded down with figurines of wondrous power, ioun stones, familiars, and cohorts. It will be all about the fall of magic and how the later ages came about.