What impacts valuation of a company more; is it dividends or is it buyback of shares?

As a shareholder, what should I actually prefer; dividends declared by the company or share buybacks? What is more profitable for investors?

What is preferable for shareholders; dividends or buyback of shares?

Do buybacks really add value to shareholders and how do they impact the valuations or P/E ratio of the companies?

I had bought 500 shares of Jain Irrigation @ 106 around 1 year back. The stock was supposed to be a very attractive pick at that point of time, but it has only gone downhill. What is the prospect for this company?

Is there any difference in the way the buyback of shares is taxed versus the way in which the dividend paid out by a company is taxed?

Is there possiblity revival of Cox & Kings? Shall I hold or sell the shares of that company and its subsidiary company Cox & Kings Finance?

What are the conditions under which a buyback of shares becomes really justifiable to the company and to the shareholders?

What are the principal advantages of the reverse book building system for buybacks and for delisting of shares?

What is the fundamental difference between a buyback of shares and payout of dividends by companies?

When I buy shares and become a shareholder of a company, what are my rights as an investor?