Generally speaking, file to where your 485 is.

My wife and I live in New Jersey. Our 485 were transferred from VSC to TSC. We received the transfer notice from TSC a few months ago.

I mailed the EAD renewal application for my wife to TSC about one month ago. Already got the receipt from TSC and the check has been cashed. The case number starts with SRC, meaning it is handled by the Texas Service Center.