I tend to agree with both Vern and Mathias. It sounds like you are at the very top end of the lineage armor size range (although in reality, with enough shimming any armor can be made to fit any body), and that ATA ABS (like AP) has a solid reputation for both quality and customer service. Both also require trimming, so it seems that the work in getting either kit ready to wear is about the same.
In the end, if you have narrowed your options to those two then I suggest looking at photos of several different examples of assembled kits and deciding which look you like best. There are subtle differences between the two that, with time and practice, you will learn to identify. Better still would be to find someone in your local garrison who owns the kits in question, pay them a visit, and have a look up close.