I've had the chance to work with a 10 year old version of Aquarium as well as the 2025 version, and I honestly cannot tell an appreciable difference between them at all.
The database of games may have been updated and the pre-bundled chess engine may be a recent version of Stockfish, but some of the bugs are still the same.
Given that neither Aquarium nor Chess Assistant seem to have any changelogs with their new version releases on the company's website, my concern would be that CA is similarly stagnating and being re-packaged. That's not to say that a new user wouldn't find what's already there usable and useful, of course.
Meanwhile, ChessBase hypes up their latest innovations with every release, even if some of them are
completely pointless and fall very flat. While each new version of ChessBase may have a notable new feature, some of its basic functionality could be languishing.
For example, trying to create a
Lichess Elite database by importing many PGN files into a new database is trivially easy in Scid, its progress bar chugging along reassuringly.
In ChessBase, figuring out how to attempt the same thing was a total nightmare in comparison, and the program became completely unresponsive for 36 hours straight. The only reason I didn't halt the process was that I noticed the database's filesize was slowly increasing.
Another thing that Scid does glaringly better than ChessBase is its ECO classification. It updates dynamically as you step through the opening moves of a game, catches all transpositions, and overall is much more informative with letting you know what variations you're looking at.
Lastly, ChessBase's reference tab sees the most use from me when I'm reviewing a game, but Scid's tree window is comparable and feels about five times more responsive.
TonyRo wrote on 02/24/26 at 17:03:27:
BTW, there is also En Croissant/Pawn Appetite, which are both in development and work across all major platforms. Pawn Appetite is a fork of En Croissant, as development on the former stopped and the developer went dark for a while.
Now that you mention it, En Croissant seems to have had a major new release in the last few days with the added ability to create and train opening repertoires. Could be worth a look.