Bernice is a really good heavy armor in all honesty. "Nothing special" might be true, but she is a very solid unit and a core part of my own army, maybe because i did not get the ONE plat and black that exist, but all things considered you are much more likely to get Bernice compared to the other two.

Plus in some cases you'll want double heavy armors so she works very well together with Maribel (not to mention the vampire maps, maribel just plain sucked on those).