Your life savings mean good of money in different altcoins, right? Then mate, don't go for any application based wallet, it's your savings, so store it in a securest wallet like Ledger or Trezor! Hardware wallet cost not greater than 100$ and it is easy to use and safest also. But If you don't want a hardware wallet, then go for Trust Wallet, Coinomi is good but Trust wallet is better. Good luck.