Which wallet do you like the most? Personally I really like Exodus, the only con is that it's not fully open source, but other than that it's a great wallet!
Are there any wallets which allow you to have multiple addresses?
In terms of altcoin I must prefer to use Myetherwallet because it is reliable and so easy to use. But of course it depends on a person if what crypto wallet he want to use as long you can keep your password and private key very well.