I couldn't say that Best is "sweeter" than Weyermann, but my perception is that it has more flavor. Like Paul, I was pretty much a Weyermann guy until I tried Best.
BTW, this was the yeast I used...
Wyeast 2782-PC Staro Prague Lager Yeast
Beer Styles: Bohemian Pilsner, Munich Helles, Vienna Lager, Oktoberfest/Marzen, Munich Dunkel, Schwarzbier, Traditional Bock, Maibock/Hellesbock, Dopplebock, Eisbock
Profile: This yeast will help create medium to full body lagers with moderate fruit and bready malt flavors. The balance is slightly toward malt sweetness and will benefit from additional hop bittering. A fantastic strain for producing classic Bohemian lagers.
Alc. Tolerance 11% ABV
Temp. Range 50-58°F (10-14°C)