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The UVSJ will be cheaper and slightly quieter, if you don't need the amplitude boost.
Re the DB8e, there may be larger antennas that are more sensitive (ie 16 bay bowtie), but the DB8e is already 4' square. And they won't have the capability of aiming the panels in different directions. Alternately you could stack conventional yagi antennas, and get a 3dB boost for each double the number of antennas.
Really, I think the DB8e is the SOTA unless you go to a rather exotic or huge antenna. Its recent design means it's optimal for the UHF band, as UHF was narrowed by the FCC in 2009. Most UHF antennas on the market are optimal for 14-69, while the DB8e and DB4e are optimal for 14-51.
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