1. The A-share market is the largest stock market in China, with a broader investor base and high liquidity. This means that China Ping An's shares are easy to buy and sell, with low transaction costs and easy to attract investors' attention. Hong Kong stocks are unstable and not highly liquid, so A shares are good.

2. Because investors in the A-share market are optimistic and active, the stock price in the A-share market is high. This means that China Ping An's shares will have a high valuation in the A-share market, thus increasing the market value of the company and the wealth of shareholders. The stock price of Hong Kong stocks is low and there is no room for development, so A shares are good.