While the sidewinder will do fine with a bec on 3s, the hw80 is a more versatile esc and can do 4s with need of an external bec. Plus the price is very close. I do have a few sidewinders and they are great escs, and I have not tried the hw80, but it has had favorable reviews and seems to be a bit underrated on its amp handling ability.
The real question is- can that motor handle a Sidewinder? The SW is rated for ~70 continuous at 3s lipo. If the HS specs are right (?) then the SW will have NO trouble running that motor. An external BEC is ALWAYS a good idea because it takes the load off of the ESC.