BDD.Mine's value is a calculation and it drops pretty much in proportion to the dividends its paid out. its not exact, but there is a small percentage swing each way if you hold the winner out of BDD.MINE and BDD.SELL. In Theory, if you have both BDD.MINE and BDD.SELL, the total value of your investment plus your dividends will never change.
While PETA-Mine is a security. It has assets that are purchased using the funds raised during IPO, and funds provided by CryptX. CryptX uses these funds to invest in assets, these assets produce income, and that income is used to generate more assets and pay dividends. Unlike BDD.Mine, PETA-MINE's share price is set by the market, and not by a calculation.
Basically, these are two completely different things. If you don't fully understand what BDD is, then for your own sake, stay away from it. it is a very complex financial instrument, and is not there just for a simple buy-and-hold strategy.
I check this thread sporadically; surprised to see BDD pop up here! I'm the fund manager for BDD
mikemikemike speaks the truth when he recommends only speculating in BDD if you know what you're doing - it's a seriously multifaceted derivative and is very much unlike a stock, bond, or managed fund.
While B.MINE is cheaper per GH/s at the moment, there is no fund reinvestment or anything of that sort - you get the equivalent daily payout of a 5GH/s miner and nothing more. The share stops paying out once all of the funds for BDD are exhausted due to paying out dividends to B.MINE (if the difficulty increases / stagnates) or once 200 Days of dividends is less than .2mBTC (if the difficulty continues to increase).
PETA, on the other hand, has more equipment coming (as I understand it), will continually reinvest in the venture, and will sell off underperforming equipment at the end of its useful life (I assume).
B.MINE is valued on the market at what some speculators think the value of a 5GH/s miner will mine over its useful life. PETA is valued on the market at its current hashrate, the hashrate of future hardware, any BTC it has on hand, and the (eventual) liquidation value of its equipment. It's really an apples to oranges comparison, but B.MINE does offer a good benchmark rate on how the market values mining at a per GH/s rate (currently cex.io represents about a 65% premium over B.MINE).