Just coming back from a wedding, where I (had to) use the Yamaha DGX 630 of the church for Cohen's Hallelujah. After that experience I'm all the more happy about my own instruments

I would have to A/B them directly, I'll do so later, but spontaneously I would say the SRX 06 ones (some of these are from the 1990s vocal expansion, one also from the (Titanic soundtrack-inspired) SR-JV Orchestral II from 1999) are very good, and the SN-A are nearly identical. There is also a boys' choir in the SRX 03 which is very similar to the SN-A one.
You probably know this demo I made of the SRX 06 including choirs (from 6:48 onwards):
https://youtu.be/qDtLBJeNF6I