new family members during processing time

I married my husband soon after he got the quebec selection certificate. He applied for PR as a quebec selected skilled worker and we decided that I would be a non accompanying spouse,( because we don't want to quit our jobs at the same time in our home country). during the processing time I gave birth to our son. Now here is the dilemna: I want to know what wil be faster: He continues the application with me and our son as non accompanying family member or he add us as on the application as accompanying. Which one will be faster. they are asking for additional documents and we don't want that adding me would slow down the process. If he gets PR, how soon will he be able to sponsor me after landing? We don't want to be separated too long while he is in quebec. Please give me some advice.
PS : OK the main question is which one is faster: adding new family member during the process or wait after landing to sponsor