Are you sure I wrote that? That would be a difficult claim for me to make. The last iPhone I owned was an iPhone 3G. The last iPad was an iPad 2. I never tried using either with any OBD-II BT device, including those owned by customers. Mostly, I've used various OBD-II BT devices on a variety of Android, Windoze, ChromeOS, and Linux computahs. I will confess that I did help a friend reset his engine warning light and record the codes using his iPhone 4 and one of my OBD-II dongles. However, that was so long ago that I don't recall if I had any problems or if I was successful. Probably successful because I tend to remember the problems and forget the successes.
Also, if I had claimed that something "works better", I would have provided comparisons, details, and examples. I always do that.
Incidentally, I consider iPhones and Android phones to be rather similar at the user level. Perhaps as much as 90% similar if I don't explore the architecture and details. Apple and Google have been borrowing each other's ideas for a long time. As evidence, I've noticed that it's not very difficult for an iPhone user to quickly learn how to use an Android phone. The reverse is also true. The only thing that's really different are the names of the various functions and how deeply Apple and Google bury them in their menu systems. Extra credit to vendors, such as Sumsung, that add proprietary enhancements to help lock in their customers who don't want to learning too much that's new.