I use both and I love both. I am using AAR1 and ETC 1 and 11/2 with my kindergartener and he is progressing wonderfully. I also am using AAR3 and closing our ETC experience with my second grader. She just finished the 8th book. I like both because I get the 1 on 1 time with AAR and then ETC reinforces and gives them extra practice with reading and some extra writing practice.
