The list is many of which WA doesn't do, or in the odd case does but with great amount of tweaking compared to ADDT.
But having said that WA does have iRite and as you mentioned eCart. WA also does have other tools in the design portion that ADDT didn't have.
I am a Adobe Community Expert for ADDT and share the frustrations of many ADDT users. I am desperately trying to get away from the ADDT and start using WA exclusively. But there is just so much WA can't do ... yet anyways.
I'm starting to get the hang of WA stuff, but wow, what a learning curve.
I won't get into which is better because it's just not professional to do so. But I will definitely say the WA has 100% more support than ADDT since Adobe took over from InterAKT.
My advice would be to use WA on any websites you plan on editing after CS5 comes out. By then hopefully I/we will have mastered the WA stuff! ;-)