I personally don't think you can go wrong either way...it just depends on your personality. Some people are a little more outgoing naturally so if you already attract attention to yourself, then an attention grabbing suit may be over kill. Whereas if you're the quiet type, maybe a black suit/white shirt combo may make you forgettable. I personally did exactly what green wave did - black suit, white shirt, red power tie, and in every single one of my interviews I was actually the ONLY person to have that combo. Everyone else tried "to stand out" with tan suits, neon green ties, purple shirts, etc etc. The most important things are that A) you're professional and well kept. B) whatever you're wearing fits you well so you don't look sloppy and C) just be careful trying to make a statement with your clothes in general. Too conservative can be too boring and a sign of no personality, but being too stand-out-ish (worst word ever) or too "flashy" can either mean that you're potentially arrogant or too insecure to where you're relying on your suit to make you memorable. Maybe I'm just a jerk but the way I see it, if you have to wear something outgoing to make yourself memorable in an interview, then your interview is not worth remembering lol. 🙄
But basically, if you dont want to do the black or navy, try a dark charcoal - it looks like a black but not really, and if done well, can really catch someone's attention for being a smooth suit. 👍