>>1826552The Walmart bike has mechanical discs, and the cost of going to hydraulic is $40 usd per pair of shimano MT200, which are going to be better than the tektro m275 those marin bikes likely come with. Not sure what you mean by "cockpit accessories" unless you are talking about the shimano acera shifters. My bike came with those and it was a clunky drivetrain that the chain fell off when I bounced off curbs.
Schwinn Axum comes from walmart with a dropper post at $499 and has everything these bikes come with and more besides having only mech disc brakes.