I have to assume you are talking about the Apprentice Jr Gent, and not the Jr Gent 2, as the JG2 is not, IMO nearly the same as the Baron (significant size difference...) I may be wrong, but the Jr Gent 1's (Apprentice now) that I have gotten (the gold Ti from Smitty) still have the black threads like the barons have, and if it were between the 2, I would generally go with the Barron, as the end diameters are the same on both ends of the tubes (1 size for the body, another for the cap) where the JG1's have 4 different measurements, and since I do my turning without bushings between centers, that means a LOT more measurements and numbers floating around (lonely and carefree) in my head...
I do like the tapered looks of the JG1s, so I would still do them for some things, but if I want to kick stuff out, the extra measurement is a turn off...
Now if you meant the JG2, then that is a different ball of wax, I love the JG2's size and feel well beyond the Barons...