As others have said look at the traits that you want rather than the breed. Although there are stereotypes for each breed not every horse has read the book so doesn't necessarily know how they're supposed to behave
It's also going to depend on your experience with handling horses. Some RS riders are fairly accomplished riders but rarely get to handle horses. Others are expected to do a fair amount of stable management in addition to the riding (best way in my opinion
) so are more experienced in coping with less than ploddy horses.
I found, though, that when I went to look at horses that my 'ideals' went out of the window and I quite simply fell in love. I'd gone there thinking that I would fall in love with every horse that I looked at but I didn't. I saw Saff and I was hooked even though the third horse was my 'ideal' on paper!
My 'ideal' was a 16hh+ dark bay, warmblood mare, 6 years old MINIMUM. Saffy is a 15.1hh, steel grey, RSIH mare and was 5 years old when I got her
Ok, she's a mare and in theory she's 'warmblood' (with a small 'w') in that she's IDxTB but not Warmblood in the breed sense of the word. If you'd have told me that I'd have chosen her (she was third on my list just because I wanted to look at a few) before I went to see her I'd have told you no way no how! Now, of course, I wouldn't part with her for the world