Difference between sm4303r and mg995 servo

Other Hardware Motors, Mechanics, Power and CNC
3

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:
https://www.amazon.com/RioRand-SM-S4303R-Continuous-Rotation-RR-BR301/dp/B00X7BPI1K/ref=sr_1_fkmr0_2?ie=UTF8&qid=1508016993&sr=8-2-fkmr0&keywords=sm4303r+continuous+rotation

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.