There are around 10+ ways to store Bitcoins but I believe that storing funds in the offline manner is the best option in terms of security but one should always keep in mind that he is the sole person responsible for his actions. I am fan of paper wallet and Trezor wallet when it comes to the offline holding.

* 12 Ways To Store Bitcoins Review - Hardware, Desktop, Mobile, Online & Paper Wallets?

This article might help you to understand the 12 ways to hold Bitcoins and take your decision.