If I'm flying with people whom I can trust my back, who aren't afraid to push the 190 aggressively when it comes down to multiple engagements, then the 190 is by far the superior choice.
If I have to fly alone, or have to do everything from the merge to the final coup-de-grace myself, or the people around you aren't very aggressive and can't to anything else than resort to lazy BnZ tactics despite there's an enemy plane right behind your tail, then I'd up a 109.
The 190 is simple and straightforward, needs no complicated tricks, and suited with people who fly with strict self-discipline.
The 109 is complicated, flashy, aggressive, and suited for people who like the hybrid E-smart flying style that lies somewhere between pure TnB and BnZ.