Seriously?
The iPad2 is faster, lighter, and has more built in hardware features than the iPad. It will also likely include the ability to take advantage of future iOS features longer than the iPad 1 will.
Whether the price difference of an ipad2 vs. an iPad1 is worth it to you can only be determined by...wait for it...you! Try them both and decide for yourself.
I won't grace the Android tablet part of your question because every android tablet I've ever pick up made me throw up in my mouth a little bit. (disclosure: I've not tried the latest and greatest, nor have I used ICS).