For beginners, it's best to start with a mountain bike.

The advantages of choosing a mountain bike:

1. Enhanced adaptability and traction on various road surfaces.

2. Increased availability of budget-friendly entry-level models, with the option to equip mid-to-low-end models with racks or rear seats.

3. Greater durability compared to other bikes at similar price points.

Disadvantages of choosing a mountain bike:

1. Road bikes outperform mountain bikes in speed on commuting roads due to factors such as rolling resistance and weight.

2. Heavier body construction.

When it comes to selection:

1. Opt for reputable brands; Merida, XDS, and Giant offer popular mountain bike models, while Forever, Phoenix, and Perpetual are suitable options for commuting purposes.

2. Consider the intended purpose: If this is meant to become a hobby, starting with brands like Merida, XDS, and Giant is recommended.

3. For city riding activities, purchasing a mountain bike is advised; consider buying a road bike only after gaining sufficient understanding of mountain bikes.

In conclusion: It's advisable to purchase a mountain bike with an increased budget of 2000 yuan or above for an enhanced experience.

If faced with the choice between road bikes and mountain bikes: Opt for the highest-budget brand of mountain bike within your means.

Advantages of Mountain Bikes:

- More comfortable riding posture

- Wider tires leading to better traction

- Strong throughability

- Ease of purchase from reputable brands

Disadvantages:

- Heavy build

- Less aesthetically pleasing

- Limited potential for upgrades

- Rapid depreciation when sold second-hand

Advantages of Road Bikes:

- Sleek appearance

- Aggressive riding position

Disadvantages:

- Affordably priced options are considered basic

- Narrow tires limit performance on rough terrain

- Inadequate braking power  

- Limited potential for upgrades

It's important that as you gain more experience in cycling you may come to realize that investing in a low-end road bike was not ideal due its limitations in terms of features such as unlocked pedals which can be inconvenient during rides (Why do road bikes have so many requirements? You will understand these things gradually.) The lack value in upgrading stems from the fact that lower-end frames restrict their potential making high-end component additions appear mismatched while also being difficult sell off at any significant value if upgraded components were added later on . Low-end models may not provide much room for upgrades without exceeding costs associated with purchasing new bicycles therefore rendering upgrade attempts unnecessary."