None of them are really ideal for belaying, they are more geared towards active use as the wind will cut through all of them without a shell on top. So the Uberlayer is probably about 1/3 warmer and about 1/3 heavier than the Nano-Air, and probably doesn't breath quite as well - but would be more appropriate in colder weather. Perfect for aerobic climbs and ski tours, the mens Uberlayer jacket combines weather-resistance, warmth and breathability for a jacket you can wear whether. The Uberlayer seems to be OR's answer to the Nano-Air, although it has 98g/m2 polartec Alpha while the Nano Air has 60 g/m2 fullrange. It’s large enough to slip over most helmets (we tried the Smith Variance and Giro Range ski helmets) but isn’t overwhelmingly big. Its hood has a partial wire brim that’s easy to manipulate and adjust and provides good protection and field of vision. Not all that warm though - for New England Winters I imagine you would want something warmer. The Uberlayer jacket is only offered in a hooded style.
The Uberlayer performed reasonably well in our tests. The Outdoor Research Uberlayer is a well constructed, highly breathable jacket that, along with the Nano-Air, is changing how we think about layering. It weighs four ounces more than similar jackets but does not make up for the extra weight with added comfort, durability, warmth, or lower cost. Stuffs into a pocket with a clip loop as well, and has drop in pockets inside which is a nice touch. Perfect for aerobic climbs and ski tours, the men's Uberlayer jacket combines weather-resistance, warmth and breathability for a jacket you can wear whether you're on the move or breaking for lunch. The Outdoor Research Uberlayer is an active insulation jacket that scores below average in our ratings. It is a really well done light synthetic jacket. The stretch panels give it great mobility, but the wind can cut through them when it is blowing. Designed for high-aerobic ascents in cold winter weather, the Uberlayer is filled with a breathable and moisture-resistant Polartec Alpha insulation to keep you. Same light insulation where it is insulated. The Cathode is basically a Nano-Puff with light softshell panels under the sleeves and on the sides.
(The Superlayer seems similar but not the same as the Uberlayer). Save up to 80 or more on used Outdoor Research/OR Uberlayer Hooded Jacket Mens Synthetic Insulation Jackets. I have the Cathode but not the Uberlayer.