From my perspective, the most secure method for protecting your Bitcoin is a multi-signature cold card wallet. However, the physical storage aspect poses a significant challenge, as demonstrated by the estimated loss of over 1.5 million Bitcoins to date.

While there are certainly robust solutions for safeguarding your Bitcoin, they tend to be complex and place a heavy burden and responsibility on the user.

I’m not very familiar with the Blue Wallet option you mentioned.

Big Key is a decent product, but it might not be very robust. It involves too many parties, apps, and technologies that could potentially be vulnerable to hacking and trust.

Bitcoin is fundamentally designed to be secured using a 12-24 word seed phrase, which is the most reliable and secure approach yet most challenging.