FPGA Compiler vs Amplify
Obviously,
FPGA Compiler is nothing when compared to amplify. I have worked with both of them a lot, for big designs. Amplify (which uses the same synthesis engine as Synplify) is much more powerfull. Synopsys has not done anything good in FPGA synthesis. Instead Amplify is almost a physical synthesizer. If you are doing big designs for one of Xilinx Virtex-II or Altera APEX-II FPGAs, and your design should work with high clock frequencies, (100MHz or more) FPGA Compiler will not do anything for you. Instead Amplify, I think is the best possible solution.