Flying from DFW-DCA in a couple of months (rare opportunity for advance purchase), I instinctively started to book AA, rather than US, as US operates a EMB170 on the route.

However, as I thought about my minimal upgrade chances with AA (low fare, PLT), I wondered how the LRTC seat compared with the US Express seat.

Interestingly, the EMB 170 seat appears to be more spacious, with the following dimensions:

Seat width: 18.25" versus AA's 17"
Seat pitch: 32-33" versus AA's 31" - 32"

Although the EMB170 is a regional jet, its coach seat appears to be roomier than all the seats in AA's fleet except the 767 and 777 following full rollout of LRTC.

Am I looking at this right? Following AA's elimination of in-flight service, is there any compelling reason to book AA on this route (as usual out of DFW, AA is significantly more expensive)?

I am PLT with AA and Gold with US, so I get bonus miles with both carriers.