Is btc1 wallet safer than btc core wallet for running a p2pool node (anti fraud or something) ?
I will be forced to synchronize everything again to the btc1 wallet ?
Safer? It depends on how the November fork plays out. It will be safer to use whichever node the other people you want to transact with are using.
btc1 will follow Segwit2x. Bitcoin Core will not.
Currently, 90.9% of the network hashrate is signaling support for Segwit2x (
https://coin.dance/blocks). Segwit2x also has the support of Bitpay, Coinbase, and every other major Bitcoin company that has registered an opinion on the matter except for Blockstream. Blockstream, plus a number of smaller companies (Échange de Montréal, Bitbrains, Bitstop) oppose it (
https://coin.dance/poli).
Personally, I think Segwit2x will be the dominant chain. The data seem to be in its favor. I could be wrong, though.
The blockchain downloaded by btc1 and Bitcoin Core will be compatible until November. If you want to switch, all you need to do is stop one bitcoind and start the other. After the November fork, though, it will require you to resync your blockchain in order to switch between the two.
veqtrus's code (v17 shares) is incompatible with btc1, and only works with Bitcoin Core. My code will work with either btc1 or Bitcoin Core, though it will give you a warning message if you try to use Core.
Respectfully I believe your assumption that support for Segwit2x as the dominate chain is wrong. In slushpool the strongest support goes to Bitcoin with only 10% signaling for for the fork. I don't know but the source you are showing as evidence may only be getting their information from like minded people and not from the community as a whole. As for the exchanges signaling their support , I know that Coinbase was not going to support it to begin with and then rethought it from a economic point of view in that they can make money off of the split from people moving their coin from one branch to another after the split.
I think people are people and will move in their own self interest which is why it has taken so long just to get segwit to activation in the first place. People do not like to feel uncomfortable expressly when their money is involved. The new chain will have to prove itself before people will jump into the pool. Look at how long it took Bitcoin to increase in value over $10.00 per coin. Consider Litecoin, Darkcoin, Dogcoin, Ethereum and all the rest. Ethereum is one of the newest and has been preforming better that Litecoin which has been around longer. What has happened to the others?
I think is a good move on your part to support both sides until you know which way the coin will land. I believe you may have blinders on though.