I would pick Orochimaru. We already seen the results of Naruto and Sasuke's training after 2 1/2 years with them. It was a big gap of Strength, Speed, and Ninjutsu, Genjutsu, Taijutsu.
Training with Orochimaru would make me stronger than with the other two. But still, living with that
guy for 3 years....? I'd rather just train with Jiraiya and be a fodder that gets killed after 3 years, then
to be stronger after 3 years of Orochimaru's "experiments".
There are a lot of fools here. lol. I would train under jiraiya.
Of course Orochimaru's teaching reaped great results! Because he wanted to nurture Sasuke's body for himself. People do things exceptional well when it comes to their own well-being. If Sasuke was a fodder ninja, orochimaru wouldn't give a shit about him and he would be fodder after 2 years of training. Even worst than naruto under Jiraiya.
1. You only become kage level with Orochimaru if you're WORTHY.
2. You risk getting raped by Orochimaru.