Well I guess in your opinion, but don't expect it to be a really popular one. (Since I don't know of anyone else who feels Jake Long Season 2 is better then BTAS, STAS, BB, JL, JLU etc) Anyway we're suppose to be discussing Juniper Lee vs Jake Long, so no need to bring any Batman or DCAU series into the mix to do that, okay?
As for the question itself, I prefer Juniper Lee over Jake Long. Although Jake Long actually had a continuity that was actually able to evolve over time and have plots and characters that grew (Juniper's continuity kind of for the most part got stuck in a rut. Even the changes they tried making in season 3 really didn't do much for the overall continuity sadly) it still had a lot more annoying factors to me then Juniper Lee. Yeah Ray Ray was annoying but I found more annoyance with the Jake cast (probably due to Jake's over ego about everything and always having to learn a lesson. Seriously American Dragon is like American Dad when it comes to how over annoyingly they try and have the main character learn something in every show and how little it sticks) then I did with the Juniper cast. Also Juniper had a lot smoother coregraphy and general animation then Jake Long and the jokes, even if they didn't hit had a higher air of... I guess sophistication then Jake Long tried for. So yeah I find Juniper Lee more enjoyable even though it still had flaws since it had less flaws then American Dragon.