Drake VS Ultramax? Great question! I'm replacing 3 23+ yr old toilets and was wanting answer/comparison too.
To help answer this question - Go to the following... http://www.savingwater.org/inside_ba...toilettest.htm
According to the test in above link (see update of May 2004 too), the Drake has much better flushing ability.
Hopefully, Terry will give his opinion. What about it Terry?