Air Asia is a bad choice. Yes this company is expanding rapidly now and future prospect is not bad too. However Air Asia is very lousy at hedging activities. This is the reason its share price drop so heavily. Furthermore commodities prices is expected to rise in the near future including crude oil. Cost of Air Asia will significantly increase so Air Asia is not a good choice of investment.
Sime Darby is a good choice as it's a plantation based companies. However it still have some major company. It's car and power business are not looking good.
If you buy Sime because of rebound in commodities, then you should consider Hang seng Plantation, Perlis Plantation or IOI as these comapanies focus more on Plantation business than Sime.
However if you buy these 2 counters because you think their future prospects, then you should do more studies and find other counters that will perform better.