What is the better QoS choice for an ISP to operate?

25 pts.
Tags:
ISP
Networking services
QoS
If a tier1 ISP (internet service provider) has to choose a carrier of two, one use IP/DWDM, the other use OTN (IP interface should be used), if the two carriers has the same cost then QoS (quality of service) will be the effective factor for choosing one of them So which one of them is expected to has a better QoS supposing the network elements of the two carriers operate ideally? And why?

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