Depends on how much value you're storing. Muun might be ok for what you'd keep in your back pocket. For more, I'd be less concerned about mobile or lightning and go with Bitcoin Core or Electrum on Linux. For long-term and significant amounts of your yearly income, a hardware solution with multisig starts to make sense (Trezor, Coldcard, or Blockstream). To go with your software/hardware be sure to invest in educating yourself as the value of your savings grow.