ASICS often are faster than more general FPGAs, and FPGA's use a lot more energy than a comparable ASIC. But the reprogrammable nature of FPGAs is an incredible

ASICS often are faster than more general FPGAs, and FPGA's use a lot more energy than a comparable ASIC. But the reprogrammable nature of FPGAs is an incredible advantage. And there are even some phones that have FPGAs integrated now a days, so there are lower power options (altera) which would be appropriate for mobiles/laptops.