Why the Marin Bolinas Ridge 1 is a Better Value:

1. Drivetrain: The Marin Bolinas Ridge 1 and Trek Marlin 4 come with a Shimano Tourney 3x7-speed drivetrain, offering a wide range of gears for tackling various terrains.

2. Brakes: Mechanical disc brakes provide reliable stopping power and are easier to maintain than the hydraulic disc brakes.

3. Fork: Both bikes are equipped with SR Suntour XCT coil-sprung forks, offering similar levels of suspension for trail riding. However, the Marin Bolinas Ridge 1 may offer a slightly smoother ride due to differences in setup and tuning.

4. Tire Clearance: Both bikes have adequate tire clearance for trail riding, allowing you to install wider and more aggressive tires for improved traction and control on rough terrain.

5. Price and Value: Generally, the Marin Bolinas Ridge 1 tends to be more affordable than the Trek Marlin 4 while still providing reliable components and performance suitable for entry-level mountain biking, making it a better value proposition for budget-conscious consumers.

6. Comfort: Both bikes are designed with comfort in mind, featuring ergonomic grips and suitable saddles. However, personal comfort preferences may vary, so it's recommended to test ride both bikes to determine which one feels more comfortable for you.

In conclusion, while both the Marin Bolinas Ridge 1 and the Trek Marlin 4 are capable entry-level mountain bikes, the Marin Bolinas Ridge 1 offers a better value proposition with its wider gear range, reliable mechanical disc brakes, competitive pricing, and suitable components for trail riding.