The Langton's by far have the best details. The larger ships (Brig, cutter, xebec and sloop) are the most expensive options out there. His smaller vessels (
http://www.rodlangton.com/napoleonic/frame.htm) are very nice. I have his sailed jolly boat (which is TINY), British gunboat, yawl and launch are really nice models. I do not like the brass sails. I had issues folding them properly and ended up replacing half of them with paper. A nice item is that they have a small crew pack with these tiny ships. I didn't bother with the crew as it would be one more item to break and fall off of them.
Sea Dog miniatures (
http://seadoggamestudios.storenvy.com/collections/1527164-sailpower-6mm-scale-ship-kits) tend to be a bit chunkier but they are also built to be handled. Their design philosophy is that they provide bare masts that can be removed as damage is accrued. You don't need sails as 90% of the time, what else sail plan you had added to your model will be wrong for the circumstances. They have nice detail and paint up very well. They have some new row boats but you have to make masts and sails for them if you want to go that route.
Warartisan (
http://warartisan.com/ships/1300_scale_ships) are paper models so while you would think they would appear a bit flat, at arms length, and the size of the model, you can't really tell that. The more details you add (rigging) the better they look and more sturdy they are. The best part is, he offers several free models for you to try out before you buy. And at $5/model, they are the most cost effective solution there is. He doesn't have launches and pilot boats but does have some smaller schooners and the like up to a three masted sloop of war.
In all, I like all 3 manufacturers. I have more of the Warartisan ships than I have made. He has a 1/600th line and a 1/900th line as well. He is still developing his lines actively and is coming out with some middle eastern and Indian Ocean ships soon.