What to use depends on the year (and sizes of the minis).
If you want to make a unit till the end of WW1 you may use anything from the Woodbine, GWM, Brigade and Renegade ones. (In fact I think that the new officer for the Senegalese, is very nice).
For midwar period (Pulp?) the best I can see is the askari chap in the middle of the pack FRP-1. The Artizan officer lacks a detail, the scarf, otherwise usually artizan has nice figures. I remember some earlier photo here in LAF, maybe an earlier LPL round, had a nice unit made of Artizan and some other minis I cannot remember)
I think that usually renegade and redoubt are at the large size while wodbine and the rest usually are a little smaller.Since I do not have any FFL minis I cannot suggest anything in particular, but I think that CiC miniatures are more combatible with artizan (and maybe the rest, like woodbine etc ).