For more specific advice, please contact an immigration attorney. Most of us provide consultations via Skype. In general, landed prpoerty, job, bank accounts, other assets help in showing suffixient ties with your home country. I would suggest that you seek an immigration attorney to chalk out the best strategy.
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The better you are able to demonstrate that your parents will be coming for a specific purpose temporary in nature, have the ability to support themselves and ties to their home country, the more likely the application will be approved. However, even with a good application the US consulate has discretion to grant or deny. Once a denial has been issued it is even more difficult to obtain an approval. Ti crease the probability you may want to have just one parent come. An immigration attorney can help.
Attorney Robert Brown's (former INS Director, 1972-99) reply to your question is general in nature, and does not constitute legal advice as all facts are known to him. For specific advice or representation you should retain an attorney experienced in immigration law. Mr. Brown's reply on AVVO does not create an attorney/client relationship not constitute legal advice.