It has been my experience with Stumps that the smoke flavor is mild and very clean. That is because the smoke wood is placed under the fire and generally does not come in direct contact with fire. Additionally, the smoke must pass through the fire before entering the cook chamber, which seems to "clean" it. The WSM is very easy to over smoke where as the stumps is more like an oven and is very easy to under smoke.
2013 Stumps Classic - Delivered 4/15/13
Large BGE - Rescued 2012
2010 WSM 22.5"
2010 Weber genesis gas grill
Rescued 22.5 Weber One-touch gold
BBQ Guru CyberQ
2011 Built UDS - Retired