Dunno about you lot but I'd prefer N1/N2 as my "engine power"
instruments.
N1 can be likened to RPM and N2 to MaP - i.e. what work the
engine is really doing. The CFMs of the 737-300 I was pretty
much at home with.
Nowadays EPR is something that the V2500 engine maker says
I have to set. Yes its accurate for TO but referencing that gage I
draw no feeling of what actual elbow grease the engine is doing.