Beethoven's piano trios cover a large segment of his life and are entirely different creatures. Compound this with many performances by world class players and it is hard (delightfully hard) to make recommendations.
I was lucky enough to be a graduate student at Stony Brook where the Beaux Arts Trio was resident. I got to know Bernard Greenhouse, the Trio's cellist, and managed to attend more than a few of his master classes as well as performances of the Trio. I love the tone of his cello (a Strad) - perhaps more than any other cello I've heard. One wonderful master class had Yo Yo Ma visiting (he was the hot young thing back then). Yo Yo sounded wonderful on Bernard's cello - of course he didn't know it well to take it to the limits, but he tried some of the Bach 6th Suite on it. Bernard then played the same measures and then Yo Yo responded. I wish I had known enough music to appreciate their conversation at the time - I wish I had a recording.... but back to Beethoven.
My favorite set of performances is the 1965 recording by the then young Beux Arts Trio (Daniel Guilet, Bernard Greenhouse and Menahem Pressler). The BAT is noted for their freshness and total commitment to the performance (Pressler was amazing to watch - almost appearing mad with a mixture of delight and intensity).
When compared to many other performances (especially those in the past two decades), the early trios are fresh. The slower tempos are almost percussive at times and the finales are dazzling - every note is there in the right place, but the pace is much faster than you will find elsewhere.
The centerpiece of most collections is the Archduke and I've never heard a better performance than this one. In listening to my old LP set (in preparation for digitizing it) I found that the Archduke is badly worn, while the rest of the set is only moderately worn.
You need this set .
A bit of searching reveals that Philips reissued the set on CD about ten years ago. Try hunting for Philips 438 948-2PM3. You also may be able to score a copy of the LPs at a good used record store - there is the risk that the previous owner has played it too many times.