according to my small experience JRT are a bit more independent than beagles, they seem to have a bit more pepper than beagles which seem to be a bit softer in their temperament.
beagles often get along well with other dogs, while some JRT seem to be a bit more picky when it comes to humans as well as dogs.
both need a lot of exercise though...I've seen so many fat beagles, which is just sad.
Also: both can have a lot of preydrive and depending on where you want to walk with them, there's the chance that you'll never have them at the point that they can run off-leash.
beagles often get along well with other dogs, while some JRT seem to be a bit more picky when it comes to humans as well as dogs.
both need a lot of exercise though...I've seen so many fat beagles, which is just sad.
Also: both can have a lot of preydrive and depending on where you want to walk with them, there's the chance that you'll never have them at the point that they can run off-leash.