Difference between sm4303r and mg995 servo

Can anyone tell me the main Difference between sm4303r and mg995 servos?

I find fewer sm4303r servos nowadays and more mg995s.

Is there a big quality difference?

One is continuous rotation, the other is a servo. One has metal gears, the other doesn't. The weight and torque ratings are different. In fact they have almost nothing in common.

Steve

Arent both servos? Dont they both have 360 rotation variants?

MG995
Continuous 360 degree:
https://www.amazon.com/KOOKYE-360-Continuous-Rotation-Helicopter/dp/B071DW6F7K/ref=sr_1_1?ie=UTF8&qid=1508016922&sr=8-1&keywords=mg995+continuous+rotation

180degree:
https://www.amazon.com/Gouptec-90Degree-Continuous-Rotation-Helicopterr/dp/B01F6OJCBW/ref=sr_1_2?ie=UTF8&qid=1508016922&sr=8-2&keywords=mg995+continuous+rotation

SM4303R
Continuous 360 degree:

180 degree:

Torques seem similar at around 7-8 kg-cm

Yes mg995 have metal gears but mg995 360 is $11 vs 4304R 360 is $13.80 which seems backwards to me.

You already know more about them than I do. I've never seen or heard of a continuous rotation MG995.

Steve