I have a 12" AK and it's got a great chop feel, but it doesn't feel as comfortable for other things like fighting or cutting to me. I like the 12" chitlangis aesthetically, but they wouldn't be in my first couple choices for a smaller khukuri I was going to use for anything.
One thing to consider is watching for oddball sizes in the 13" and 14" range.
14" BDC - This has held it's spot as my second favorite after my 20" M43. It's nice and light, easy to use as a fighter and has good chop to it. It's also one of the nicest looking, with a smooth black horn handle and double fullered blade.
13" Yangdu Katunje - Small, light and has an elegant simple design. It's got chop, a narrow but thick blade, and the handle fits my hand a lot better than the 12" AK or chitlangi. Oh, and it's neeeeemmmmm.
13" Pachtar - Really different looking and has the chitlangi-style cho. Balance is a lot different than the BDC and Katunje and it doesn't have the forward weight that gives that choppy feel, but there is chop to it, it's just further into the arc of the swing. It has a better thrusting point than the others.
YMMV, and I've noticed that what I like shifts a bit. After working out with a 37 oz. 20" WWII, my feel for the smaller blades shifts from when I've been working out with the 20" M43, 22" chitlangi, etc.