I consider the 414 to be, for most purposes, the better mic, if only for it's multipolar versatility, and for its multi-level pads and bass rolloffs There are reasons why the 414 is a standard fixture in pro studios and TLM103 isn't. As an overhead, the 414 rocks. It is also a wicked mic on
acoustic guitar and a bunch of percussion. It is a stunning vocal mic, but only for a minority of vocalists. On some singers (Celine Dion, for instance) it's the right mic. For others (Meatloaf), it's not. It is, however, on the short list of vocal mics for many pro studios, when more commonly used tube and FET mics aren't right. Basically, they put up a U47 or AT4060. If that doesn't work, they put up U87. If that doesn't work, C414 is next. If that doesn't work, they put up a good dynamic and EQ it.
TLM103 is not a bad mic, in fact it's a pretty good mic. It is, however, overpriced for what it does, because it has almost no doodads, and you pay a lot for the little red diamond on the front. I don't consider TLM103 to be a mic that's a whole lot better than an AT4040, which is about $400-500 less. The 414 is a studio workhorse with a bizzillion uses. There is very little that it doesn't do at least fairly well, and a few things where it's a lot better than fair. Don't leave home without it.-Richie