Shouldn't you be paying attention? For shameeeeee.

Well if it's going on a fixed gear bike, I'll go with SPD-SL's because the design and declipping motion of speedplay pedals (tension is not a issue here; no matter how high you set it at) is more likely to unclip accidentally with the possible range of motion and backpedaling experienced while riding on a fixed gear; you can still ride with speedplay and not unclip accidentally on fixed if you know for sure you can keep your foot from accidentally declipping during a skid/ backpeddling or if you're running a brake.

As for a roadie, it's your choice; but if you're a total weight weenie go for speedplay, it saves a couple of grams.