All I have are the primos hand calls & they do ok, but never had a custom or elctronic to compare it to so...
What I like about the open reed calls is the versatility, they do about any kind of coyote vocals (howls,barks,whines,distress) & can double as a distress call (coon,deer,rabbit,bird) to call predators with.
If ya want to go ultra cheap you can kiss the back of your hand to make mouse squeaks for free, I've even made a call from a rubber dog toy I bought 99cents, take the toy & cut about a 1 1/2 (or how ever big ya want) circle around the squeaker, when in use I turn it so the my teeth can bite the squeaker & hold it in place, this also leaves my hands free, or (for a little different sound) turn it around & make a circle with your finger & thumb & hold it in place or like your hold'n a cigarette to your mouth.
I also took a plastic cap from a soda bottle & put on of these toy squeakers in it, can be used as is or cut the bottom of the bottle off & screw the cap back on for a slight boost in volume.
This is just some junk I do when bored, a distress call is pie to make.