If you company sells those property after making money, your company will still be taxed 20% (small Sdn Bhd) on the profit and there's no exemption on RPGT.
Becareful of hidden charges of Sdn Bhd.. secretarial fee, accounting fee, auditing fee etc...

For profit lower than RM500k p.a., the tax rate is only 20% flat. Anything higher taxed at normal corperate rate.
Your profit from buy and sell property will be considered income. I am not a tax expert, but my accountant vaguely said if income above 150k, then suggest to form Sdn Bhd. But just remember u have to pay for secretarial, auditor, account etc.. which may come up to be a few k a year.