AuroraXL Plus or + is AuroraXL dialled up to 11, more colour, more detail, more everything. It's great at doing busier and more intricate images compared to AuroraXL. It loses some of it's realism so doesn't overlap with CFXL as much but as you can see from the images below the trade off is well worth it.
All my SDXL models come with this VAE baked in https://civitai.com/models/140686/fix-fp16-errors-sdxl-lower-memory-use-sdxl-vae-fp16-fix-by-madebyollin?modelVersionId=155933