I'm thinking about buying the first season of Batman: TAS. It's got a lot of great episodes, like "Robin's Reckoning" and "Heart of Ice" (both of which won Emmys). I looked for it at Best Buy, but they were sold out, and all they had from the Timm universe was "Tales of the Dark Knight" (which I have heard is a good episode) as a single release, and of course Gotham Knight, Batman Beyond, and also the Justice League seasons and New Frontier and Superman vs. Doomsday. I understand that there's also a complete series collection for BTAS, but I don't have the money....So since they didn't have the first season of TAS, I decided to just get The Batman season 1. Yeah.
I think there are basically three series that make up Batman: TAS. The first is seasons 1-2 of BTAS. The second series, The Adventures of Batman & Robin, makes up seasons 3-4. The third series, The New Batman Adventures, makes up seasons 5-6. They're all basically the same, but with minor differences. The Adventures of Batman & Robin just emphasizes the partnership of Batman and Robin. But The New Batman Adventures has some character re-designs (i.e. Joker having darker hair and black eyes with white pupils, and no longer having red lips; Penguin looking more like his classic counterpart instead of the deformed Danny DeVito version; Scarecrow becoming more of a corpse-like figure with a noose around his neck) and focuses less on Batman and more on other characters like Batgirl, Robin, and Nightwing (note that the same thing happened to the recent series The Batman - during its later seasons, characters were re-designed and the show started to focus less on Batman). TNAS had memorable episodes such as "Legends of the Dark Knight" and "Mad Love."
So, having not followed the series that much, I'm asking which era you think is best, seasons 1-2, TAoB&R (seasons 3-4), or TNBA (seasons 5-6). Also, which design of the following designs do you think is best for each character: