The only advantage of the 60 series front is to lower the front by a few MM to shorten the trail. If you don't hit the twisties hard or visit a road track this will have no advantage at all. I've never seen a 60 series front tire on a busa. The 55 raises the rear a few MM also shortens the trail. The 190/55 is a very popular choice over the stock 190/50 however. In your situation, it makes little difference. I'd suggest staying with the stock 120/70 front and 190/50 rear.
If I were chosing between a "Stinko" and a Continental,,,,,,,,,,,,,,,, those Germans make pretty good stuff!