Unfortunately I don't really understand the various protocols OMR supports, so my experience comes from measuring aggregated speed/latency and stability. XRay worked best for me and also supported QUIC if enabling proxy UDP over XRay/V2Ray. However, due to the omr-bypass issue, I've disabled that option and QUIC (which is the default setting).
They are extremely popular in the "niche" of censorship evasion especially in countries like China and Russia. There are many more such protocols as well like OBFS/Shadowsocks/Snowflake/Meek etc.