I prefer via survey observation values via FBK as it is raw. I find civil 3D data reduction tool an extremely effective utility. All my survey data are imported like as follows:
STN 1000 1.423
BS 999
AP OFF
FC1 VA 123.1212 234.12 89.2311 "EOR"
........
AP ON
FC1 1001 VA 45.2154 233.12 90.1145 "T-2"
.......
STN 1001 1.234
BS 1000
AP OFF
......
....
This format provides you the ability to take advantage of the power of Method of Least Squares data reduction utility which is extremely effective in Civil 3D.
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