I understand BCC/BCH is similar to lumen (but 1:1 ratio based airdrop).
BCC/BCH is just an altcoin is being created with air drop plans based on snap shot of blockchain as of August 1st 2017 12:20 UTC.
The difference between altcoins that use BTC addresses for airdrop and BCH/BCC is that BCH/BCC copies Bitcoins blockchain and uses it as its own. To claim BCC you need to import your private keys (which might endanger your BTC wallet in the future), while in altcoin airdrop you need to sign a message with BTC address. This is because BCC/BCH code is very close to Bitcoin, while other altcoins can have major differences.
So, BCC/BCH is an airdrop altcoin, but a bit different from other altcoins. For example, you can claim it anytime you want after the fork, while other airdrop altcoins have centralized distribution which is active only during some time frames.
Why big hype on BCC/BCH and how they will survive 51% attack ?
There's no hype for it, so far only some exchanges accept it. As for 51% attack - just as the other altcoins. No one is going to bother attacking them.