I like the Accurate line of powders, and Accurate #2, #5, and #7 are all appropriate for the 9mm Luger. I also like Hodgdon's Universal Clays ("Universal") for this application instead of Unique, and have included it in the list.
The following data is presented for your info. It is for a 115gr jacketed bullet. Maximum load data for the Accurate powders is from Accurate Loading Guide v3.3, and for Hodgdon Universal from Speer Reloading Manual #14. Prices are from the Powder Valley web site. Since Accurate #2 is only sold in 5lb jugs, its price per 8lb is extrapolated. All four powders measure exceptionally well for me in my Lee Pro Auto Disk powder measure.
Powder ........ Max ..... Vel ... Ft-Lbs . #/Lb ..... 8 lbs ...... ¢/rnd
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AA #2 ......... 5.2gr ... 1145 ... 335 ... 1346 ... $104.80 ... 0.97¢
AA #5 ......... 7.0gr ... 1192 ... 363 ... 1000 ... $116.00 ... 1.45¢
AA #7 ......... 8.8gr ... 1196 ... 365 .... 795 ... $116.00 .... 1.82¢
Universal ..... 5.3gr ... 1172 ... 351 ... 1320 .. $114.00 .... 1.08¢
Personally, I like to load my 9mm Luger practice rounds to about 1100 fps (309 ft-lbs), and find Accurate #2 to be very efficient, clean-burning, and accurate. Also, among spherical powders, it's one of the least-expensive. YMMV.