depends on your weight and what you want, if your like 150-160 and under then lizzies would work good, if your over 150-160 bacons would probably be better, and inbetween 150 and 160 you could go for either. bacons seem to be more for powder riding and bc jumps and obviously bigger riders. lizzies are more for bc jibbing, bc jumps, and park, cause they are easier to throw around and have a slightly different sidecut so they turn alittle quicker. so still not much difference between them both are good in pow.
and remember that pollard designed them to ski more like a snowboard with snowboard like sidecut and all and snowboards are short, so if you think 172 is too short, its designed to be that way.