I tried the PedWest in both directions and it is indeed faster. However it is a MUCH longer walk. Take notice if you have mobility issues. Walking into Mexico, there was a line of people backed up. I thought that was weird, but I waited. Then another guy came up behind me griping about "los chinos" and just pushed past everyone and walked in. I then realized that the wait was for a group of Asian people who had to deal with visas. So I too just walked past it all and right into Mexico. The Mexican immigration officers did not even look up as I walked past them.
On the way back there was a long line, but they had a separate aisle for Global Entry without any line so that took all of a few seconds to get back into the US.
BTW taxis now cost US$7 from PedWest to town and an Uber cost over $8.