I have had an M3 both ways (With and without EDC). Skipping EDC was a no-brainer for me on my latest M3 (ordered this one). If you run coilovers it's a button that becomes useless and you have to code it out. I was not impressed with the EDC suspension settings (I rarely went out of the middle mode). In the end coilovers are the best option considering you can tune the ride quality and height.
KW Clubsport 3-way, Akrapovic Evolution, ESS Tune, StopTech Trophy, IND Euro Bumper & Black Mirror Covers, Turner Motorsports Studs/Lugs & Delrin Diff Bushings, MRF Solid Sub-Frame Bushings, RD Sport Sways, Recaro Profi-XL & Planted Seat Brackets, BMW Performance Carbon Fiber Interior Trim, BMW Edition Grills/Gills, Mode Carbon GT4 Splitter & GTS Wing, Advan TC3 (18x9.5/10.5), BBS E05 (18x10/11), G-Force Rivals (275/295)