Those are both going to be down on power if you run the A/C. My dealer said he wouldn't order anything under a DK50 or XR4046 with a cab unless the buyer was absolutely certain, and never for a model on the lot.
Between the two, the only major negative for either is that the LS loader has a lot less lift (10-11" as I recall) and that can cause problems. On my LS R4047 I could barely load a 30yd rolloff dumpster, or my neighbors 5yd dump truck....it was just barely possibly which meant you had to go slower, and be more deliberate, which cuts into productivity.