I consider a wallet if it's a decentralized wallet and a non custodial wallet, any wallet i will have to use must be an open source cold storage, not all cold storage were open source, i try also to make use of wallet that are common and not only that, those that are reliable that can secure my asset for life, wallets like hot wallet are not reliable because they can be hacked or closed at anytime,when the source code of a wallet is made publicly available, they you can go for it as an open source, generate your keys and safe keep them to always use whenever you wanted to important your wallet on any device at anytime.