This works with either a link to a Twitter user’s profile, such as https://twitter.com/jordanmerrick or a direct link to a tweet, and it doesn’t matter if the link points to the desktop or mobile domain.
It’s largely unnecessary to have the workflow ask which Twitter client you use, since most people likely just use the one day-to-day, so you should modify the final steps of the workflow to automatically open your preferred app.
For some reason, this workflow doesn’t want to run on my iPad with the iOS 9 Public Beta 2. I’ve tested it on iOS 8 devices and it works fine, so if you’re using the latest beta of iOS 9 then you may find it doesn’t work. But, you know, that’s why it’s a beta.