SparkDr wrote:
A thread like this always reminds me to take advice gleaned from the forums with a grain of salt. As someone who is actively involved in the plumbing materials trade on a daily basis, I see misinformation, guesswork and bad advice./ practices all being offered. Thankfully, the OP only asked why one vs the other. Anyone actually wanting to know how to properly connect PVC to ABS would do well to avoid the confusion published here.
Since you are actively involved please explain that function wise there is no difference between the two as far as getting da SH!T from point a to point b. They both have the exact same drain and vent fittings.