I have two, one digital and one analog, and use both of them. Normally analog is better in big scales, but for fish under 40 lbs or so, I use a digital that I keep in my tacklebox. Back at the lakehouse I do have one for large flatheads that weighs up to 110lbs, and it is very accurate. I would suggest using both, but if you are only going to use one, and you aren't interested in getting any fish over 50lbs, one of the digital scales from berkley is easy to get and easy to use. The 110lber is one I had to find online and is supposed to be used in commercial kitchens.
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"That's why they call it fishing, if all you did was catch, they would call it Catching!"