Cherry picked stats often don't show the true picture.
In the last 4 games played:
Markstrom - 97 shots, 12 goals against, 9 1/3 periods of play, incl 1 OT loss (2 losses, 1 OTL and 1 no decision)
Vladar - 97 shots, 9 goals against, 9 2/3 periods of play, incl 1 OT loss (3 wins 1 OTL for the 2/3 periods)
Just looking at the pure stats doesn't allow you to draw any conclusions.
When the goals against happen make a big difference.
Down by 2 to NAS and by 3 to COL are tough games to win.
A 3-1 lead by CHI seconds into the 2nd.
Losing a 3-1 lead early in the 3rd.
Giving up goals in the 3rd to two teams.
Those are the easy observations.
The why not so easy to answer.
When a goalie has a better SA% and lower GAA, then they are playing better right now.
In the last 4 games, Vladar has been the better of the two.
Don't get me wrong, we need both of these guys having good seasons.
I would tend to start Vladar against the lesser teams and bank the points.
Throw in games where he has played against the competition well (Dallas, EDM, TOR).
Give the tough starts to Markstrom against teams like Seattle, Vegas, Minny, WPG.
We have to beat those teams with more than just a goalie battle.