Which would you recommend for the LATIE system?
Sorry for the delay in this answer, but I have been out of town (and away from the computer) since mid-last-week.
I am not sure. I know from the standpoint of memory usage and user ability to control what you hear, when you hear it, the Uniden is far superior to the GRE method. That said, if you are in the NOLA area and plan on listening to the simulcast sites, then I suggest you find someone in the NOLA area with a PSR-500/600 to meet you so you can give a listen. I have not, and although the recent firmware upgrade improved things on the Uniden BCD396T/996T drastically, I am not sure that they rival the PSR's yet based on reports that I have gotten from someone I trust. I was just in the NOLA area (trip above mentioned), and although I did not get the opportunity to do a side by side comparison (by 396 vs a GRE model), I could still say that improvement could be made on the Unidens when it comes to the simulcast situation.
As for the recommendation of using the 396T, it is a good radio, but it is hampered by the "old" Uniden method of only allowing 1 control channel per system (bank) to be used; whereas, the BCD996T does not have that limitation.