One of the reasons why I want to use bitcoincore is because bitcoincore is a wallet created by satoshi.
Satoshi also descriped the possibility to use a SPV (Simplified Payment Verification) wallet
in his whitepaper. That's what Electrum does.
Do you think both are equally safe? and can you explain a little about the advantages of electrum and bitcoincore?
See:
Choose your Bitcoin wallet for pros and cons.