Very easy, if often drive alone/single/no children then go for M3. Handling better and more fun to drive as a driver. Civic not bad too but just behind M3.

If often fetch ppl, go for civic, Civic more spacious, rear aircond, larger boot, better NVH and more comfortable (softer suspension vs M3)

M3 GL 2.0 better power vs 1.8 CIvic.

But civic 1.8 way better specs than M3 GL
- Remote engine start, Walk away auto lock, Digital Auto aircond, rear aircond, Auto break hold, electronic handbrake, DRL, 8 ways power seat, Cruise control, Full LCD Meter .....