Hands down, my favorite Mahler release for 2025 was the Semyon Bychkov/Czech Phil. M3 on Pentatone. For me, it presses ALL the right buttons.
I just finished listening to this last night and came here to see if anything had been posted about it. I absolutely LOVE this performance. Now grant you, I haven't listened to an M3 in a few years so there is some getting reacquainted for me. The whole orchestra sounds amazing and I am thrilled that the percussion is prominent at all the right moments, like the first movement southern storm. The trombones in the finale gave me goosebumps. Although Bychkov has one or two gratuitous slow-downs, he is superb at building and releasing tension. I have a vague recollection that the final timpani strokes are supposed to be quieter as they reach the end, whereas here they are maximized. Bychkov's way works for me.
I am going to make time to listen to my standard-bearer M3 Bernstein/NYPO/Sony because the Bychkov one strikes me as on that level after 1 1/6 listenings (I listened to the finale twice).