For now I am using electrum for the long term storage and blockchain.info wallet as the web wallet which is more safer when compared to other online wallets.
I wouldn't recommend electrum for real long-term storage.
If you really plan to hold long term (meaning you don't want/need to touch these coins regularly), a cold wallet would be more suitable.
This can either be accomplished by using a hardware wallet, creating a paper wallet or using an offline PC for storage only.
Electrum is only as secure as your whole setup (your OS, installed software; PC in general) is.
I also wouldn't call blockchain.info a 'safe' online wallet.
There is no real reason to think that it is anyway better than one of the other web wallets. Web wallets are generally way less secured than mobile-/desktop- wallets.