I would advise looking around for reviews. Gramohone Magazine is my most trusted source but if I had to choose from those you've mentioned, I'd go with the Deutsche Grammophon just for the Herbert von Karajan recordings. Anyway, DG certainly have some fine artists on their label.
Personally however, I would collect Beethoven recordings separately. For example The Florestan Trio's Piano Trios (Hyperion). The Takacs Quartet String Quartets (Decca), Isabelle Faust Violin Sonatas (Harmonia Mundi), ...
Here's a list of venerated Beethoven recordings from Gramophone;
https://www.gramophone.co.uk/features/article/the-50-best-ludwig-van-beethoven-recordings