Best on Test
EMAX ECOII 2807 1300KV
The EMAX Motor has great performance across the board. The only downside is that it's a heavy motor and that reduces it's weight normalised performance. If you're not too worried about weight this motor is a great value choice.
T-Motor F90 2806.5 Motor - 1300KV/1500KV/1950KV
For a 7" long range quad using lighter pitch tri blade or biblade props the F90 has plenty of performance at a lighter weight than the 2808s which gives longer flight time. 1300KV on 6S is my recommendation.
Brotherhobby LPD 2806.5
These Brotherhobby motors use a unibell design which may be slightly more durable (although that's usually less of a concern for 7" quads). Brotherhobby are well known for making quality motors, particularly in the larger sizes.