I learned to ride on a Quarter Horse and learned to hold on on an Arabian.
LOL.. Most of the QHs I have ridden were willing and kind. Smart and really easy to ride. And I LOVE the looks of a well bred QH. Plus if I stand next to one it makes my butt look small.
Just seeing a Quarter horse butt showing through the back of a trailer makes me smile. Love it!!
To be serious, I really have felt safe on the QHs I've been on. When I do get another full sized horse I'm seriously thinking of a QH rather than an Arab. (That's saying a lot because I love the Arabian!)