Electrum is a reputed wallet but it is an online wallet, not recommended for holding huge amount unless you used it on an airgapped device in a way that it is a cold storage wallet.
This same word "cold" would be bridged anytime you want to make transaction as you will change to "Hot" for transaction.
Any person who wants to build a house must first sit down to analyze the cost to be incurred from getting materials, to paying off labor, until the structure is fully erect.
Same analysis of process to adhere to which must include the safety of the coins/investment and cost to keep it safe and make it worth the while, must also be carefully studied before investing, mostly into cryptocurrency where the popular saying reads, not your keys, not your coins.
Furthermore, I think knowing the amount to be invested should be a determinant to the kind of wallet to be used. We don't expect a big or whale investor to use electrum or Trust wallet, unless it's specifically designed for them for that purpose. A small investor shouldn't worry much about how safe a wallet is but how to ensure that the security protocols is adhered to including keeping the key phrases safe and if possibly device means to diversify funds or reinvest it on regular basis.