Versus Brisco?

Similarities:
-Both are historical action-comedies starring Bruce Campbell in the title role.
-Both play fast and loose with history incorporating anachronistic characters and technology for comedic effect.
-Both feature a super intelligent animal who helps the hero on occasion—for Briscoe it is a horse, for Jack it is a parrot.
-Both show Bruce Campbell wearing a hat.

Differences:
-Briscoe is more serious; the comedy serves the action, à la Indiana Jones. In fact, one of the creators of the show, Jeffery Boam, wrote Indiana Jones and the Last Crusade.
-Jack is more silly; the action serves the comedy, à la Austin Powers. In fact, Mini-Me, Verne Troyer, guest starred on several episodes as Napoleon.
-The comedy on Jack is much broader and bawdier. Jack frequently cracks jokes about…well, various bodily functions. There is more sexual tension between Jack and his partner (female partner) than between Briscoe and his love interests.
-Briscoe is an idealist and is well educated. Jack is a rogue and pokes fun at his partner for her sophistication and intellectualism. Yet, Briscoe and Jack do share a skepticism of new technology.
-The villain on Briscoe is much more intelligent and more menacing than any of the villains Jack has to deal with. Jack’s main villain is the French governor whose name happens to be Croque (pronounced “croak”). That should give you some idea of the level of sophistication the show is going for.
-Briscoe is a western set in the early twentieth century, Jack is a swashbuckling adventure series set on Palau Palau in the early nineteenth century.
-Briscoe has better production values, because it was a network show filmed on the Warner Brothers lot. Jack was a syndicated show filmed in New Zealand and produced by the same people who made Hercules and Xena.
-Each episode of Briscoe was an hour long; each episode of Jack was a half hour.

The bottom line:
-If you’re a fan of Bruce Campbell, you will want to check out both shows, if you haven’t already. You can never have too much Bruce. I also highly recommend his new show, Burn Notice, on the USA Network here in the States.

-If you’re not a fan of Bruce Campbell but just happen to like Briscoe County Jr. because of its send-up of western conventions, you might like Jack of All Trades because it sends-up Scarlet Pimpernel/Pirate conventions (it just sends them much further up!).

-If you like Briscoe County Jr. for its action, wit, Lord Bowler, or gun play, then you should probably look elsewhere. Wild, Wild West is the closest show I can think of, but even that is a stretch.

Hope this answers your question.

Brisco County Jr is the best.