ANJ-4 every time .....
1. Pockets
2. Design ( cuffs, armpits, zip, pockets, bottom hem, collar are all superior on the ANJ-4)
3. Wearabillity ( especially in more flexible sheepskins like the Fenland skins used in the older Aero's and Eastmans )
the B3 has a more classic look ( more down to it's use in movies and PR material ) ... the ANJ-4 is a better designed jacket IMHO.
Hi repo. Are you satisfied with your Anj-4 ? Unfortunately too big for me...I've got the 3/4 zip which I'm not sure I would have specified but guess it is quite flexible - I haven't tried it on my bike yet. I think mine has the standard smooth A-2 horsehide: http://www.aeroleatherclothing.com/product-detail.php?id=2266 and think it works well.
I think it depends on the build of the wearer.
For you Sloan - and guys like you - ANJ-4.
For guys with less lender or "in shape" profiles, the B-3 probably works better.
I like both, but if I were to be able to justify the cost and having a jacket I'd wear maybe 4 days a year, I'd get the ANJ-4.