There are a few factors to determine what kind of fundraisers for schools you should consider. Obviously your financial target is the most important. We have all sorts of fundraisers for schools that operate with various profit margins and minimum order requirements, so you need to find one that matches the amount of money you hope to raise.
It is also important to take into account the size of your group, because this will help you see which fundraisers for schools make sense in your circumstances. If you are working with a fairly small group, then perhaps you should consider a high-profit fundraiser, and pizza cards would be a great choice for something like that.
Finally, think about your target market, the customers who will be supporting your cause. With certain fundraisers for schools, the products are aimed more toward the student market (candy bars, for instance). With other fundraisers for schools, the target market is more toward the adult end of the spectrum (our green catalogue fundraiser, for example). So the key is to balance all these factors against each other, and find the fundraisers for schools that make the most sense for your situation.