Perhaps the more solid creature is the one you've had the connection with for the longest.
I was just thinking, and perhaps it is the fact that you feel most comfortable or most connected to the Wolf that makes it more 'real' to you? If that were so it would make sense that that would make it more solid in it's appearance.
It's odd that none are Fae when as you say, you have always thought of yourself as Fae of some kind, though of course there may be some Fae there that you just have not discovered yet.
But then lots of us think of ourselves one way and end with being shown that that which we have always thought is not reality.
Zygo began thinking of himself as a Dragon, and turned into a Pheonix somewhere in his journey. My friend Darke thought she was a Vampire, but it appears she was mistaken, and so she is searching again. I always thought of myself as one of the Fallen, but on the very good advice of a friend, I began counting my feet, and found four instead of two. It turns out I'm a Pegasus!

So it's not unusual.
Do you feel you may be a mixture of these creatures, or do you think they are just totems? And have you seen Durga before in your meditations?