Jimmy schafers is pretty good. I'll be honest even the one from wood haven sounded good but imo was way to pricey. Actually everything woodhaven is way too pricey.
If I remember right a Buddy of mine had one from Sadler McGraw was good too.
Myself I figure about anything can make a decent purr as little as they're used. It's not worth it to me to carry a pot strictly for a sound or two.
Oftentimes purring is a content type call in use. Feeding shows contentment. Almost any call can softly cluck n purr while you scratch leaves and there'd be one less call to lug around.
I do understand the need to own/carry every situation call. I've just backed off from that myself