I am looking at a skirt sports tank. the sizing is medium 8-10 or large 12-14

I am a 10 -12 (why can't manufacturer's EVER size them that way? ? ? ?

Does anyone have any experience w/ this brand and would I be better off getting the large size or the medium seeing as I would have to choose

an 8 would definately be too small and a 14 too big