I'm a fan of spring scales. Electronic is nice if you need to know to the ounce what a fish weighs, but will one last 20 years? Mmm...???
Mechanical scales will last a lifetime with minimal care. The good ones can be passed down to generations.
Chatillion is probably the best scale on the market, and you can have them certified by Chatillion for record keeping, but they will cost you $$.
Manley also makes good scales, I had a 50# one for years.
I have a 25lb Shimano scale and I wouldn't trade it for the world. It's very accurate and I can actually use mine to set trigger pull on firearms, it's that sensitive. It's ALWAYS in my tackle bag.
I also have a 60lb Rapala Lip-N-Grip that's awesome and accurate at well. The gripper may be a bit small for really fat blue cat lips though. They make a 100lb one with a 2ft handle and a large gripper that I'd like to get for BIG fish.
Bass Pro has spring scales that go to 100lbs and look exactly like the Shimano. They may be made by the same company, who knows? For the money, they seem like a good product, but I've not used one.