For save and secure my bitcoin I use both. I separate my bitcoin about 75% to blockchain, and 25% again I save to xapo and coinbase. For me, blockchain is more secure and fast than xapo or coinbase.
You got it, blockchain is the most secured bitcoin wallet provider. But of course we are not the same, we have our own perspective on why we are going to like ones bitcoin wallet provider.
But for me, Blockchain would be the best even though I tried to use xapo but I stopped already I hated their 60 second cool down for security.
Unlike blockchain's email verification.
I still use xapo because i often sent and received bitcoin with small balance and free to transfer. And i still collect bitcoin with playing xapo faucets, because many faucets that only use for xapo wallet.