I've never used a thumbhole stock on a bolt-action, just rimfire autoloaders.
But since you mentioned coyote hunting...
To me, prime coyote season is cold weather and I'm wearing pretty hefty gloves and an extra layer of clothing or two.
I don't know if this is a factor in your area but if so, then it's something to keep in mind. Both for the size of the thumbhole and the actual pull length of the stock.
I've seen lots of guys fight with too long of a stock when they're all bundled up for winter still hunting.
On my "winter rifle", it has 3/4" shorter pull length than most of my other rifles to factor in the extra coat that I wear when I'm out calling yotes.
I'm sure the same will apply to the thumbhole too, so remember to take your gloves with ya when you go shopping.