Yes Liriano is a good young pitcher who may rebound next year, but Vladdy has been on a tear since coming back from the DL. He has been hitting for power. If he can put you in a slot to make the playoffs this season, I would take it. Vladdy should help you more this season, so long as he can stay on the field. But its not like Liriano has a clean bill of health with all his injury concerns.
And then there is always this...
According to Joe Christensen of the Minneapolis Star-Tribune, Francisco Liriano is in danger of losing his spot in the starting rotation.
The Twins don't have a whole lot of options, but Liriano has been shaky in recent weeks and is 4-11 with a 5.63 ERA on the year. "We’re talking about a lot of different things," said manager Ron Gardenhire. "The one thing we don’t want to see is him get too far in the dumps. This guy’s got a high ceiling; he’s got great pitches. Right now, he’s pretty frustrated, and we’ll talk about that."
From Aug 6, so I doubt it happens this week, but they are considering making the move, which would certainly hurt his value for the rest of the season.