depends on your 3 season tent and the forecast...i've been up there when you could sleep under the stars and other nights that it howled
you can always rent a 4 season in you dont have much need for one or cram into the public shelter at Muir should the weather turn (assuming you're heading up the DC)
warmth is similar and while the ThermaWrap gets the edge in lightness, you will sacrifice durability and weather proofness.
although my experience with the Compressor is limited.