From a non-military/LE perspective, I've been grabbing 75gr Gold Dots. They are more widely available, slightly less expensive, and perform well. The T3 load that I'm seeing available commercially is the XM556SBCT3, and because these are rejected from contract batches, I'm slightly concerned with what I'd be getting. My biggest concern with it though is commercial availability.
Right now, per ammoseek, there are 8 sites that have 75gr Gold Dot in stock.
For the 5.56 T3 62gr load, ammoseek does not see any sites with it in stock. There are some LE223 loads available though.
Cost, availability, and performance are three factors that need to be weighed for each person's needs. My needs may not match your's, so take the above in that light.