Still likely going to be a close one. These two teams just play each other very closely. If it's a defensive battle, it's a close, low-scoring game. If Seahawks find their rhythm, the Rams suddenly have an offense.
Here are the scores of Rams/Seahawks since Jeff Fisher took over the Rams:
9-3
23-17
34-31
20-6
28-26
27-9
14-9
20-13
19-13
Basically, whatever each team does, the other team says they can match it.
That 20-6 27-9 and 14-9 score Seattle won.