Servo or Stepper for watch winder using Arduino?

hi everyone,

i started project building watch winder using arduino.

at moment using 4 dc motors controlled through 2 x l293dne controllers.

what want change dc motors towerpro sg-90 micro servo (that want hack go full 360) or stepper (the stepper comes uln2003 driver).

the motors looking @ are:

stepper - http://www.instructables.com/id/byj48-stepper-motor/
servo - http://www.servodatabase.com/servo/towerpro/sg90

my question is:
which 1 better taking consideration want slow rotation (6 rpm), different direction of rotation , motors should handle weight of light wooden cylinder 2 watches in it.

i forgot mention using time module ( start motors @ hours period of time) , rotary switch ( tell motors direction)

thank much

i think project stepper best bet.

also there servos run 360. easier hacking one.

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