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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Another reason is that the author of Sequel is generally much more diligent when it comes to performance. For example, where Active Record uses custom classes (e.g. for attribute typecasting), Sequel often uses plain arrays and hashes, as they have lower overhead. For Postgres adapter, the code for fetching rows is intentionally written using a while loop, to avoid the overhead of proc creation. As if that wasn't enough, there is even a C extension that rewrites this part in C for maximum speed.
Our Rails app at work is using Active Record, but I started non-apologetically using Sequel for any features I'm missing from Active Record, because I don't have the patience for Active Record to catch up. For our analytics database we're using only Sequel, because AR was missing too many features (see my article), while for our main database we're using it in tandem with Active Record, reusing Active Record's database connection. I'm pretty happy that the latter is now possible, as it gives people the opportunity to try out Sequel without any overhead.