Smooth-haired or hard-haired?
Jack Russell Terriers' coats come in 3 types: stiff, smooth, and intermediate (or "broken" - an intermediate type of coat between smooth and stiff).
Of course, "tinsel" looks much more dressed up. And if you're buying a show-class puppy, a stiff coat is always a winner here.
All Jackie's molt, regardless of a coat. However, hard-haired representatives can hardly molt at all if a coat trimming procedure is done on time and regularly. Trimming is the plucking of hair that is already "ripe" and ready to fall off. The procedure is quite time-consuming if you do it yourself, but you can go to a specialized salon or call a master at home. Trimming makes Jack a less allergenic dog. It turns out that people are allergic not to the fur itself, but to the skin scales that die off. Regular trimming removes these scales and the allergen along with them. Therefore, if you are prone to allergies, the hard-haired variety of breed will suit you better.
If you are lazy and grooming will not be a pleasure, feel free to choose a smooth-haired Jack.
In general, the coat of Jacks is truly unique, regardless of the type of coat. It can be compared to a Teflon coating, to which nothing sticks. A dog that has been in the mud becomes perfectly white again in a while, the mud itself becomes separated from the wool. Creating such a coat was a matter of long selection and selection by the creators of the breed. After all, to drive a fox out of the hole, you need to get into it and therefore get dirty in the ground. To wash dogs after hunting in those ancient times there was no one, so preference was given to dogs with a hard coat, capable of self-cleaning.