A normal one like everyone else I guess. No need to waste bandwidth and storage if you don't have to. If an image looks good to me, I'll try going lower until it doesn't look good, then go back one step. I've been surprised many times by just how low it can go and still look good. That script I wrote defaults to what I've settled on. (AVIF between 0.5 and 1 bpp at 1 megapixel, increasing or decreasing by square root of total pixels in image, plus JPEG fallback.)

If I change my mind, I keep high resolution originals of everything to do it again.