MEMS Oscillator vs. Traditional Oscillator

Passives Crystals-Oscillators-Resonators
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In the market, you’ll find that some oscillators are MEMS type and some are not. Is there any difference between them?

OSC MEMS
Traditional oscillators rely on quartz crystals to provide a stable frequency reference. MEMS (microelectromechanical systems) oscillators have a complex structure consisting of a MEMS resonator to replace quartz crystals as the oscillating source. Through its internal PLL circuit, a MEMS oscillator can provide a desired frequency.

Comparing a traditional oscillator, MEMS oscillator offers much more stable frequency, smaller size, higher reliability (including AEC-Q100 certification for automotive use), faster startup and high integration, as below.

Traditional Crysatal Oscillator MEMS Oscillator
Frequency stability over Temperature :+1: :+1::+1::+1:
Size Reduction :+1::+1: :+1::+1::+1:
Reliability :+1: :+1::+1::+1:
Jitter Close-In Phase Noise :+1::+1: :+1::+1:
Fast Start-Up :+1::+1: :+1::+1::+1:
Integration :+1::+1::+1: