I've been testing polars and duckdb recently.. Polars is an excellent dataframe package.. extremely memory efficient and fast. I've experienced some issues with a hive-partitioning of a large S3 dataset which DuckDB doesn't have. I've scanned multi-TB S3 parquet datasets with DuckDB on my m1 laptop executing some really hairy SQL (stuff I didn't think it could handle).. window functions, joins to other parquet datasets just as large, etc. Very impressive software. I haven't done the same types of things in Polars yet (simple selects).