The best wallet for BTC for new comers is "Electroneum" "blockchainwallet.info" "myceleum" for cold wallet you can try "samurai" I have not tried samurai though.
Electroneum: AFAIK, electroneum is an altcoin... Do you mean, by any chance, electrum (like many other have already posted in this thread)
blockchainwallet.info: This domain is for sale... Do you mean the ONLINE wallet blockchain.info (sure, as far as online wallets go, this might be the best online wallet out there, but by default, an online wallet isn't the "best" wallet out there as far as i'm concerned)
myceleum: at least, this one actually IS a bitcoin wallet. However, it's a mobile phone wallet. I wouldn't put to much faith into a mobile wallet, since mobile phones are easily lost, stolen or broken
samurai wallet: this one is still in alpha phase, it looks nice, but i wouldn't use it to store a lot of funds.