Here are just a few of the differences:
- Buckets have a flat lid, Chronicals have a domed lid
- Chronicals have yeast dump valve on bottom, Buckets don't.
- Chronicals have 3 pc ball valves, Bucket have 2 pc valve (one)
- Chronicals have standard thermowell, Bucket only comes on Brewmaster series
All that said, you can't really say the Bucket is "entry level" either, as there are several local commercial breweries in Southern California using Brew Buckets in their pilot beer or hop testing operations (Stone Brewing is one example)