I like the HTM prayerbook. I may be biased since I am from the Antiochian tradition. I think the biggest reason I like it is because the daily prayers are in shorter, manageable portions, which may be more conducive to the person who is busy/has family to care for, etc... The Jordanville has a larger selection of daily prayers, but sometimes it seems like shorter and simpler is the order of the day. Also, the pre-communion prayers. Jordanville lumps the entire canon and prayers into one service, which, if you attend Vespers/Vigil, and then say evening prayers before bed, this can be quite a lot at once for the average person. HTM breaks up the prayers w/canon at compline the night before, and the prayers the morning of the liturgy.
Bottom line - HTM just seems like a more manageable book in terms of dividing up time for daily prayers than the Jordanville. But to each his own; I suppose many here would disagree with me, and that's fine. I use the Jordanville from time to time as well, but I find myself going back to the HTM more often than not.