Ive been going 24/15 the last couple generations, but also Cav Lancer hybrid.
I dunno I'm leaning back towards 21/18, It just seems 24 is really ideal for 1-handed damage, but, once I'm in a tight spot on the field, I'm stuck there, because my opponents can run me down, and being that I often take the front line to protect my fellow non-shielders, I often find myself bieng focused by 3+ angry infantrymen, and can block them and maybe take one or two out, but usually just get over-run and mugged.
I'm actualy considering stopping on retirement, and going 24/18.
Of course as a Cav, 18 AG has alot more possible benefits, but, unless your a blocking phenomenon, or spend your time backed up/ support all the time, more agility than 15 is really attractive, and feels like the 'natural choice' atleast from my experience.
It also gives you the ability to move faster with heavier armor on too.