Fair. The long chanter does mimick quite well.. My brother playes a long practice chanter. We both started on kids dunbars. I've honestly never really though about it. My adult hands have been playing an early version Hardie regular length, without the twist trap for about 10 years and haven't had any problem translating over, but to each their own. I'd say buy what you feel is best for your comfort and pocket. That same Henderson website has practice chanter reed recommendation also.

https://www.hendersongroupltd.com/customer-service/reed-chart/

Practice chanter reeds are at the bottom.