I haven't tried it yet on my 9 because Pekka is one of my few non-upgraded troops but I'm hearing that HPHB (Healer, Pekka, Hog, Bowler (obviously in CC) is having a lot of success max 9 on max 9. You can probably find examples on youtube or in the youtuber's corner of t his forum.
Queen Pop LaLoon is strong attack 9 on 9 but the deployment and timing takes a lot of practice. I have not got this attack down myself but others seem to have mastered in. Check for Cast n Blast on youtube or search this forum for the Queen Pop thread.
GoVaHo is the TH9 attack against us that has the most success in war since October but often it is a TH10 dipping to hit our top 9s and not necessarily a 9 on 9 attack.

