The answer is it depends.... It depends on where you are? what your business is? what your assets are? and the answer to many other questions. Your question is just too broad.
If you are looking for a loan for your web development company, we might be able to continue this conversation. Otherwise, the subject would be off-topic for this board and there are other places in the internet that are more appropriate. If you are in the US, www.sba.gov is a great place to find answers. For other countries, Google is your friend. And always remember, the more information you give the better the feedback.
Both are suitable. It will be depend on your choice or affordability. Because secured loans U can get quickly and amount will be depend on you, but for unsecured you will face for some step of formality and limit amount can get.
Depends on the business you are running. For small business secured loan is better. Which type of business you are planning? As unsecured loan will be based on your income or expense but if you fail to earn maximum profit than it will be harder for you to pay off.