The form of organization that you may have will largely be influenced by the size of your organization. Taxation issues among the different forms of taxable organization is negligible because BIR, as the implementing agency (through IRRs) will balance the magnitude of taxes that maybe collected regardless of the form of your organization.
If you are small, sole proprietorship will be best for you. During registration of your business, less papers are required and so are the fees. Management-wise, you are the sole decision-maker. You do not need the consent of your partners or directors (in case your action is no within your given authority).
Finances will also play a major role in deciding what type of organization would you register your entity. If you can provide all the capital necessary to your business, there will be less reason for you to opt for other forms of organization. If you have shortages, you may opt to borrowings.
If the size of your present organization or that which you are to organize is big that you cannot handle it, you may opt to choose to have partners. Of course, we're only human to do, know and supervise what's happening within a bigger organization.