Yep, my apologies, I meant that the crytography is still the same for both up until 1 August 2017, hence security is the same, only the block size has increased, thats the only difference. In terms of security, well thats a totally new topic, becasue many people interpret it in many different ways. The blockchain algo or the crytography has never been hacked, for both, if thats whst you were getting at. So the ledger has been and looks like, till the use of Quantum computing, will be totally imutable. Now if you talk about the wallets, and the handling of the wallets and Malware for them, thats another can of worms. Git Hub is there and the source code is open to view so is a good place to get wallets from. Some wallets from the bit coin forks can be malicious, hence caution is advised if you want to claim your free tokens, hope this helps.