Basically speaking, there are 3 types of reels drags, level drag, star drag, spinning drag, that we use offshore. Of course the Fly reel is being used, also offshore, but for the most part, as I have looked around offshore, it's the first three types that are being used the most, so I will talk about those.
Sizes vary, with manufacturer, and so do the goodies what one reel can do over the next, etc.
I'm not comparing reels here, just trying to give some thoughts and believe me you need all the help you can get, when it comes down to selecting a reel in todays market place. One thing to keep in mind, whatever reel you choose, it won't be the last one you will buy. Suppose I was thinking of a reel to use inshore and offshore. You can use these reels, both places, inshore as well as offshore, depending of course, on what your trying for, and where do you spend the most time fishing, inshore or offshore. The idea here is to have reels, that you can use, a few different places.