AZ Tommy Mac

I'm not mechanically inclined, and my A/C is blowing hot. I did try recharging it with new coolant, that much I can handle. No luck. I am reading these rigs (mine is a 2016 Silverado 1500 LT) are notorious for compressor/condenser issues. Should I go get a diagnosis to see which of those two may be the failure point, or should I just replace both? Wanting to control repair cost as much as possible, but if it like buying 4 tires instead of 2, then I am in. Would the dealership provide a true diagnosis, or should I just find an independent mechanic?