Tough question. SRT is a term while grade A says quality. Most normal "red tex" are carpintis, to bring out more pearls. Quality goes on what your looking for. Delicate Pearl, Small Pearl, Big Pearl, Brain Pattern Pearl. The grade AAA in my opinion has to have some Kamfa or red dargon. Usually the reds come from KKBP or RD. The more orange-red after breed better the quality, the yellow and whiter ones are still red tex but only some fish fall under srt.
Redsyn. Red terrors. Blood parrots, RD, Midas, Fh's have all been used to create quality SRT. OHHHH the art of breeding haha.