Seeing how they are supposed to work hand in hand as a great combination, but seeing how the question is to see which is better, it is Red-Eyes Darkness Metal Dragon, not because of ATK and DEF, but because of how easy it is to Summon him, along with an effect to Summon more powerful Dragons as well. You can Summon Poki Draco and Banish it to Summon REDMD in an instant. While Prime Material has to be either Special Summoned by another method, or plain Tribute Summon it, which is usually slower.
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Light and Darkness Dragon will be switched into defense position. There is otherwise no interaction.
Light and Darkness Dragon's first line of text says that it cannot be special summoned. Therefore when it is destroyed and its last effect triggers, it cannot choose itself.
dragon rage is better
There are eight different "Red-Eyes" Monsters. Here is a list of them:"Red-Eyes B. Dragon""Red-Eyes Black Metal Dragon""Red-Eyes Darkness Dragon""Red-Eyes Darkness Metal Dragon""Red-Eyes B. Chick""Red-Eyes Wvyern""Red-Eyes Zombie Dragon""B. Skull Dragon" (Summoned Skull & 'Red-Eyes')
nothing. If you want to special summon a dragon, there's Red eyes darkness metal dragon