Ortega does have the best matchups. But remember he should really be the Angels #3 or #4 starter....in AAA
But injuries have pushed him into service and young Angels pitchers have a history of pitching well when they have their first callups like this. Ervin Santana was like this in 2005 and Saunders a couple years ago is another example. Also, the Angels bullpen may cough up a win for you, the way they've been going lately blowing leads.
Longer term, Niemann is my choice.
IF - Iannetta, Pujols, Alexei Ramirez, Zimmerman, Tejada
OF - Podsednik, Fowler, Willingham
Util - Pena, Reynolds
BN - FLopez, McCutchen
DL - Reyes
SP - Lincecum,Hamels,Garza,Washburn, Meyer
RP - Fuentes,Capps P - Aardsma
BN - Kazmir,Parra,Price