Bitcoin was well thought and designed when it was created and of course it is secure. It is more secure than anything else
The security of bitcoin is not the issue because it already has a lot of wallet that keep it secure for the investors and it use to grow, fast growth of bitcoin is increasing the security people have become financially educated and they knows how they can keep their bitcoin safe from hackers, for the security I would like to suggest you to use blockchain wallet and the paper wallet it is very convenient and reliable to use it is fast in transaction and the conformation also your bitcoin will grow safely.