Once you get into the thousands of USD, a full node would even be better.

Your node your rules

nolim1t

Agreed with this. 
As soon as the amounts get over thousands of USD, then it's definitely the best to get hardware wallet. Or is there any other reasonable option? 
Maybe also worth considering something like Casa with multisig setup at that point. 

nout

bitcoin

"Okay So Your Bank Account Is Frozen" Starter Pack

k00b

Any mobile wallet can basically seize almost all user funds at any moment. They can push out an auto update with a new function that says "send all user funds on this device to address xyz." Phone wallets just aren't safe and should not hold big amounts of money. They are for your weekly spending money.