I have the Dragonfly Red and have listened to the Cobalt and the Chord Mojo. The Cobalt is smoother. My thought is that the added punchiness of the Red might actually work better for mobile usage. One way to increase the smoothness of the Red while retaining the punchiness of the sound is to add an AQ Jitterbug.
Best portable headphones and DAC
The operative word is PORTABLE. I like my current set-up (which consists of an AQ red dragonfly and a folding pair of sennheiser headphones.) but I,m wondering if there is anything better out there. I also have a chord mojo but I,m not sure I would categorize that as portable. It mAy be fine for taking on a flights but it's too heavy for walks or bringing to a health club , IMO. I'm debating about upgrading the dragonfly to "cobalt". The reviews are mixed as to whether it's worth it if you already own the "red".