I've a Fox 40 Pearl and a Mini-40 and use them pretty much interchangeably with no problems. The mini is a bit less loud and a bit higher in pitch but I've never observed that the kids have any difficulty in hearing the mini. It seems plenty loud enough.
OTOH, don't go with one with a pea like I did my first year. It was loud enough but I ended up having to wipe off my glasses between every game 'cause I was blowing my spit all over my glasses. If you don't wear glasses or are not a "drooler" like I am, maybe no problem but it gave me no end of grief.
And, it's always a good idea to have an extra whistle - just in case.
-Homer-
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