Im surprised at the number of replies to this thread... so ill add a couple more thoughts.
1. I wonder how successful ASIC Scrypt miners will really be.
2. Im currently working on my own FPGA implementation, learning the backend algorithm is kinda fun.
I would imagine they should be about the same once they're programmed to work on scrypt algorithms.
Some say SHA-256 is simpler then Scrypt...so maybe the ASIC chips will be slower? IDk lol.