1. Playing with ladders - the Merida 500 and 600 frame may be a bit too much, unless you weigh just over 100 pounds. But Merida's racks at this price point are sturdier and heavier than Giant's. So from this aspect, it is still Merida. As for 500.600, buy the one that looks better.

2. Going out for fun on weekends - of course, a lighter car is more advantageous. 500.600 is about the same. Giant is lighter, but I personally don’t think it matters much. Personal physical strength is the decisive factor.

3. Bad roads - if there is mud or something, disc brakes are still useful. The 600 is stronger than the 500, but I don't know how much stronger... Another important point is the front fork. At this time, the shock absorbing effect of the front fork cannot be ignored. However, the 500 and 600 are both half-weighted and not very hard. It feels quite unpleasant when the road surface is a bit steep. In comparison, Giant's front forks at this price are slightly stronger.

4. When rushing down a small slope - disc brakes are relatively safer and less likely to lock the tires.

All things considered, in terms of performance: Let’s stick to 600. After all, there is still a difference of 400 yuan, which makes sense. Taking a step back, even if his advantage is not worth 400 yuan, but only 300, then the other 100 yuan is equivalent to buying an experience. As an experiment, he also has a good relationship with the store owner, so that he can buy things easily in the future. In terms of funds: If money is tight, then forget about 500, because with the money saved, you can buy some better equipment. Helmets are a must-have, and there are many other things.