The DSL is dual, which means 2 channels, the TSL has 3. Id go for the TSL (Stack or combo u mean?) over the AVT. Ive had both. You do get more overdrive with the AVT range but the volume and clarity of tone on the marshall stack is simply awesome. The again the AVT has inbuilt effects which are great. So if its combos, then got for the AVT, but if you considering the stack then Id go for that!