About iPads (and tablets) there is "small" problem, becuase they may have different resolutions (screen size), as you know even Apple have a few major screen sizes (8,3", 9,7", 10", 11", 12.9", 13"). Thank you Apple, Samsung, Lenovo etc. :/ . And all Page Builders, also ours have one responsive switcher, that may not include all the variants. 
Here, too, you need to answer what screen size you (or clients) use most often. For looking at the statistics, tablets are still only a few percent of the share, compare to laptop and phones.