Just personal opinion, but find the 2132 has more definition in the top end. Felt like there was a frequency bump mid-band in the 2134, as well as having slightly sizzly highs.
The 2134 is an "audio" op-amp, meaning that it is a de-rated 2132. The 2132 has better specs and is felt by most who have heard them compared to sound slightly better. Personally, my hearing isn't good enough (or my circuits are bad enough) to hear the difference.
