both HLC and Bisanga are great options. If you go with Dr Bisanga, i think the 4 euro/graft option is good, and you dont have to select the more expensive one.
Why dont you look at other options too? There's plenty of good options like Dr Pekiner, Keser, Freitas, Dr Hans Heinicke, Pinto, Fereira, Feriduni, Lupanzula, Mwamba, Eugenix, Pittella, FueGenix, Dr Nader (mexico), Dr Laorwong etc..