it depends. there are certain basic characteristics that they must have to pass the first stage of being considered.
1. they must be completely open source. there is just no excuse for a bitcoin wallet to be closed source, even remotely like using a closed source library while the rest of it is open.
2. the wallet has to have basic features such as supporting sending and receiving from and to SegWit addresses, create all standard address types, ...
3. don't rely on a single centralized server and be more decentralized such as what electrum does by connecting to other nodes run by anyone (the vulenteers) instead of the company itself.

usually the new wallets that pop up fail in first point (open source) and don't have to be considered at all).