I agree with strong bitcoin position. I can tell you one thing, I've read paper about bitcoin and know it's architecture (I've written software communicating with bitcoin network) and person that wrote it is genius. I encourage you to read about bitcoin architecture (if you did not already), it's beautiful. Every detail was thought about including 51% of hashing power attack, blockchains with different length, inflation, double spending etc. It's battle tested solution and i don't see any other crypto currency to challenge bitcoin anytime soon.