Synthetic oils have more stability, even at very high temperatures. There are more resistant to oxidation and coking, and have lower volatility. Their flash points are generally much higher than mineral based oils, their sulfated ash content is much lower. In addition, their viscosity is more stable across the temperature range, with lower pour points and smaller changes in viscosity as temperatures increase.
The problem is Pakistan is dust and contaminants, which dictate shorter oil change intervals, thus negating the biggest benefit of synthetic oils - a longer service life. Thus, it is better to do frequent changes with conventional oils in a dusty environment that to risk abrasive buildup in a longer lived synthetic oil, especially when using filters of a questionable quality.
Synthetic oils, compared to their conventional counterparts, are generally better oils. However, service requirements can make conventional oils a better choice sometimes.