What is the best and trusted wallet for lots of altcoins?
I think the best wallet suitable for most altcoins is the My Ether Wallet because, as we can see, it is very much secured and you can log in in many ways eventhough you have no internet connection. My ether wallet also supports the storage of ERC 20 Tokens that is mainly used by many campaigns.
Yes, I agree with you that the wallet that is the best for altcoins is My Ether Wallet which is definitely safe to use, but you still have to maintain the wallet you have because the wallet stores your assets