no, though you intended to help, unfortunately your answer was wrong. OP would have lost time going to the wrong place and been turned away, so definitely not "the best place" for OP.
Obviously when OP asked the question he didn't want to know where other people go, but where he should go. Where you or I go is irrelevant for OP.
Best immigration office is not choosing a restaurant depending on someone's personal taste and where you get food anyway.
The best immigration office is the office you have to go to which depends on location and which type of extension. All the others can't be used and are wrong locations. By saying Changwattana it is misleading and in this case wrong.
Nurachai Ninnad, deputy director-general of the department of consular affairs at minstry of foreign affairs has confirmed in several interviews (one interview with the bangkok post I listened to) that the 2 times limit no longer exists, and thus is now in line with air entries.
Everyone should decide for themselves how much credibility they give to Thai officials. I'm willing to believe him for now. Doesn't affect me either way anyway.