Drivetrain
The GMC Acadia's engine is significantly more massive than the SRX's. Bear in mind that more massive engines may use more gas than smaller ones.
Torque is the force that lets you accelerate quickly, and in this respect, the GMC Acadia is substantially more powerful than the Cadillac SRX.
Torque equals pickup, and the Acadia will have picked up and gone by the time the Cadillac SRX finally gets moving.
Utility
The Acadia will most definitely prove more convenient than the Cadillac for those of you with frequent child-cargo.
Convenience
You'll most certainly take the Acadia for a fill-up approximately as often as the Cadillac.
Comfort
While the front cabin in the GMC offers a bit more head room than the Cadillac SRX, there really isn't much of a difference.
The GMC Acadia is not particularly more spacious for your passengers than the Cadillac SRX.
Dimensions
The Cadillac SRX's tank is roughly the same size as the GMC's, though the GMC's is somewhat larger.
The SRX and the GMC compete for the same parking spaces.
The SRX's shorter wheelbase may produce a less-settled highway ride but a more maneuverable feel in daily traffic than the Acadia.
Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs approximately the same to get the GMC Acadia to the dealership as the Cadillac SRX.
With respect to fuel economy, the Cadillac SRX is slightly better than the GMC Acadia, but not by much.
The Cadillac SRX isn't much pricier than the GMC Acadia as far as MSRP.
Warranty
The basic after-sale protection that comes with the GMC isn't quite as generous as the Cadillac SRX's.