for me it is all about the C....if the proper technique is used, i prefer the how the force is transmitted to the hand and am not a bit fan of the t handle. Never really did. i have the 15+3 and love it but i look forward to c15...now if only a c18
i never liked the look of the c drills and have always used the t style, i now have a cxs and love it, its so comfortable and kinda forces you to use your 2nd finger which feels great, plus it puts the force at the back of the drill, i really like the c style, if i were to but a bigger drill given the choice of t12 or c12 i would take the c12 all day long.