They're both easy to catch

...when they bite!
Seriously, right place and time it's a piece of cake. I've had days where we landed 20+ of both species--I've also had multiple day strings of no bites.
Chinook definitely present you with a better opportunity to catch 'em when they do bite--they usually just keep chompin'. Worst thing you can do is set the hook too quickly.
You usually have to be right on a steelhead bite.
Hope this helps.