Depending the investment you want to make.People that plan to deal with cryptocurrencies with big amounts need to work with an offline wallet for more security.I've heard people that have invested a lot of money in cryptos getting hacked even if they have 2 factor authentication.That's why I recommend offline wallets.
Can cryptos be profitable ? Yes they can but its not simple. The prices fall and rise every second.Lots of research and analysis are required and never invest the amount that you don't afford to lose.
Thank you for contributing to the Steemit Community.Keep up the great work and I'm looking forward to your next posts.