Favorite ships? I've done this before, but hey, I don't remember covering WC1-2. Though, I do remember talking about WC1...
WC1 - Rapier without a doubt. It's fast and manueverable, which I need, comes with lasers for far off targets, and more powerful guns for in close. Second fave is the Raptor.
WC2 - Anything heavier than a Ferret that has AB's. I'm not into bombers that much though. I suck in those in any WC game.
WC3 - A tie between the Hellcat and the Excalibur, though I LOVE it when I get the Excal... something about speed, manueverability and massive guns. Hehe.
WC 4 - Dragon. May seem cliche, but my reason is that I use AB's constantly. The Dragon is the best in that part, plus it has unlimited decoys. Don't believe me? Well, the next time someone fires a missile at you and you're out of decoys, hit the cloak button, and you'll see what I mean.
WCP/SO - Panther in both. It's not an upgrade over the Vamp, but in SO, the Vamp sucks in firepower. The Panther is fast in all respects, and can dish out some serious damage when the situation gets hot.