I'm no expert but I think I'd go with Hiller.
The series matchup doesn't concern me, as a 3-1 record is too small a sample to guarantee anything. What I look for is 1) who's playing better and if the same 2) who can likely keep the goals down based on the opposition's recent play or likely threat. In my opinion, Hiller is the better option for both reasons. Ward has just returned from injury and isn't on top form yet, whereas Hiller has been great for much of the last few weeks. Include TB's offensive threat (more than LA) and it makes the decision easier.
Now watch it backfire!