Kevin Conroy will always be Batman to me. Michael Keaton did an excellent job, Christian Bale surpassed even that, but Kevin Conroy will never, ever be topped for me. I grew up hearing his deep voice come out of that cowl, and to date his is the best Batman portrayal period.
The first run of TAS, before they switched over to The New Batman Adventures, is a sheer lesson in perfection. From comic to screen, Batman never looked so good, nor acted so clearly like himself. And 85% of that is directly due to Kevin Conroy.
His Batman voice had such range in TAS, he could be 'Batman REALLY angry' and he could be 'Batman sad' within seconds of each other. His Batman voice was like a second skin that he just put on and wore. All the other voice actors I've heard when they use a 'Batman' voice, they only have a limited range of emotion that they can use when playing Batman. Usually its just from 'semi-angry' to 'really angry'. Kevin Conroy could do so much with his voice, and that quality certainly showed.
So heres to Kevin Conroy, the man who's been playing Batman for longer than anybody else, and who in my book will always be the one and only Batman.