Dextrose and ALA do drifferent things.
Dextrose is basically glucose with about a 100 GI, meaning that it is quickly absorbed by the body. It is good to take it post WO with prot because your body needs energy to repair your recently strained muscles and as the dextrose is absorbed, it also shuttles the protein to your mucles.
ALA is generally taken by people on low carb diets, specially CKD, and I think that it either prevents insulin spikes or the absorbtion of the carbs when they get turned into fat. It is generally taken on refeed days. I'm sure some one will correct me on this one.
Do some reading and I'm sure you'll get the correct explanations.
Hope that helps.