I believe some ships use tile-UV hybrids, but in general, please go for a UV. Tilemapping is terrible.
That depends on the textures you have available for use.
Besides, UV mapping a massive warship is a lot of work, and the results are not much different...but that depends on the warship in question and how it should end up looking, greebling, shape and other factors...the difference is usually visible only on some parts (unless you deliberately want every part of your ship to have a different plating)
I'm sorry, but I just don't see a full UV map worth the time investment, especially given the amount of stuff on my to-do list.
If this was a RTS where you can't zoom in close and fly 5cm away from the hull surface..then I'd UV map everything (for example, all my ship for SOTS are UV mapped). But then again, the ships would be easier on the detail then too.
Hell, if someone wants to UV map the Archangel, be my guest. I will send over the 3D Max model and everything.