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Cable pull disc are great, but fiddly and too many variability to go wrong (such as facing the mount for the calipers to sit 100%, the calipers isn't well build to begin with, housing that flex a lots, etc.).
The hydraulic wirth the auto aligned piston and auto adjusted for wear is much easier to forget, which remind me that I really need to service my Hylex at some point.
Good thing about the Trek is that you can try and get them on a discount.
The full hydraulic system will be quite easy to look after for you.