You don't need either for your first deal. If you are wholesaling, you can even just use your own name--no big deal. If you are assigning the contract, you will not be on record for taking any title so don't worry about. If you use your personal name, you'll just be paying taxes as your personal name. The entity used for the wholesale will allow you to pay taxes as a corporation/LLC or whatever but for your first few deals, keep it simple--use your name, get the deal done...get paid...re-invest into marketing for your next deal!