Let's start out with "What's your approximate budget?". There's a ton of option in that size range and budget will have a lot to do with what choices people offer. Second "What kind of fishing do you wish to do?" (e.g. trolling for salmon, mostly crabbing and prawning). If you're more interested in crabbing and prawning, cockpit space would be more of an issue. If you're mostly interested in trolling and want to extend your season/increase your days of fishing, something with a cabin or a canvas top would be a better option. Do you only plan to fish in the salt water or do you want something that you can take into smaller rivers also? How willing are you to be cold and wet? Again if you're willing to dress for the weather an open boat can be OK but if you really value comfort, something with a cabin or a canvas top will be better. How much boating experience do you have and are you (in general) hard on your gear? If you're hard on your gear and have limited docking experience you might be better off with an aluminum boat. If you have some experience and are a generally careful person, fiberglass might be just fine. Do you ever plan on staying on the boat overnight? That's tough to do in a boat that size but I know of people who camp in a 16' C-Dory. Do you want to be able to safely fish in fog and other tough weather? If so, you'll want a small radar on board or at least an AIS radio.
On the most comfy side for a boat in that size range, I like the 16' C-Dory or the 19' C-dory. Both have fully enclosed cabins and you can put a heater inside of them. You could camp O/N in either but the 19 is more suitable for that. Both will provide excellent fuel economy and both will be relatively expensive for their size. Both will pound in a chop but for the size they are very sea worthy. Both have a "cute factor" that a spouse might like. Both have an enclosed cabin and it's easy to put a small radar on top of the roof and keep your electronics inside and out of the weather. With either you could install shore power and a diesel heater.
On the other side of the scale, a 16-18' open Lund is a pretty good all around about. Not too expensive, relatively easy to find used and in an open boat there's a lot more space for things like crab pots.
So explain a little more about what your intended uses are and people can give you better advice.