Because I never had any HD-DVD I would not say it´s good or bad. Personal experience is: The price decide about quality. It was the same with every media I get, CD, DVD, BD. Some last decades, some only a few month
Access times are not important in this case, if you use often data with small files you will never use optical media with 1000x higher access times than Flash storage.
BTW, the access times not only depend on the time of positioning the laserhead, it also depends on the rotation speed of the media. Slower rpm means it cost more time til the sector pass the laserhead