Another huge B:TAS fan here. I'll have to agree with the posters who disliked the style change for TNBA; the characters became a little too streamlined for my taste (even though some designs were better).
My personal favourite episode has got to be "Almost Got 'Im" - it's just so much fun to watch! There are episodes which are technically better, but that's the one I've enjoyed over and over and over again. "I threw a rock at him!"
The Batman Adventures
comics were great too - especially (IMO) the first two series, by Kelley Puckett and Mike Parobeck (R.I.P.) and then Ty Templeton and Rick Burchett (with a few issues by Dini). A lot more enjoyable than the actual main-line Batman comics of the time, which were continually dominated by endless "big event" crossover stories.