Planning long term that is important.
If you are old school your power tools come with a cord that is standard. 
Major brands are clearly focused on cordless. For many hand tools the 18V platforms are quite powerful and the advantage of being cordless is seen as overweighing the disadvantages. And 36V and up becoming serious contenders for heavier tools.
The world definitely has a preference for cordless. Phones, tools, and more.