I like the openness of the plains, but I also like the greenness of the jungles, so what I do is I combine the two. I made my own texture pack and the plains have the jungle grass color.
Plains since good place to build,
Mushroom since no mobs spawn (other than mooshroom)
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Leafeon used Magical Leaf!
There is a theory which states that if ever anyone discovers what the Universe is for, it will be replaced by something even more bizarre and inexplicable.
I'm gonna go with the plains. It's an open area to spot mobs, and usually flat for good housing spots.
So my favorite biome is the plains.
Mushroom since no mobs spawn (other than mooshroom)