The answer to this question cannot be determined with Slifer the Sky Dragon or The Winged Dragon of Ra because Slifer the Sky Dragon's legal copy has yet to be released and because The Winged Dragon of Ra's (legal version) effect allows a Player to pay Life Points until they only have 100 left to add to the ATK of The Winged Dragon of Ra equal to the amount of Life Points paid.
Considering only ATK and DEF, Dragon Master Knight has more ATK and DEF than Obelisk the Tormentor in a sense that it is "stronger".
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It can indeed. Both have 5000 base ATK. Five-Headed Dragon cannot be destroyed by battle unless by a LIGHT monster, which Dragon Master Knight is. Normally both would be destroyed due to having the same ATK, but if there is another dragon on your side of the field, your Dragon Master Knight will be 5500 ATK and survive battle with Five-Headed Dragon.
The prices for this card vary per store. A good standard price for the Dragon Master Knight card is about $6.99 to $7.95.
A "Dragon Master Knight" Level 12. 5,000 atk. 5,000 def. Effect is that all dragon cards on the field give Dragon Master Knight +500 atk
Dragon Master Knight and F.G.D.
"Dragon Master Knight" is worth approximately $2.50-$9.00 USD, depending on condition and whether or not it is still in the sealed package it came in. The reason for why it is not worth a whole lot is because it is an easy-to-get promotional card. I hope this helped you out.