I'm assuming you're located in Australia, Maxdata seems to be only a local brand and Iomega dvdr is being distributed now through Maxdata in Australia. Bear in mind that the brands we get in Australia might not be readily available overseas, and vice versa.
I assume the Maxdata discs you're talking about are the ones made by Gigastorage. While they're no doubt more than acceptable discs (through PI / PF testing, longevity and coaster rate), i personally won't buy from Maxdata anymore.
I've found 2 cases of Maxdata selling faked MID media, once fake TYG02 which resulted in acceptable initial quality levels, but fast deterioration, which can trick people into believing they're decent quality. And the second occasion was with 50 spindles of Maxdata 8x dvd+r which was faked MCC003. This media was terrible right after being burnt, PI levels around 300 according to Lite-on and Benq tests.
As for Iomega 16x dvd-r, it's possibly on my list of media to try out.