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I've ridden UT through several Winters without complaint.
However, if a) absolute durability is a priority and b) you don't have the tools*, then I'd go for square taper: UT is by no means fragile, but for the use you've described I don't see what advantages it would offer.
*The cup tool is common to other external BB and the only other tools needed for installation and removal are a 10mm bit for your torque wrench (although my experiments have shown that I can get the correct torque using a long-armed key and doing it up TAF).
Scilly.Suffolk
I've got the choice of installing square taper or Ultra Torque chainset on my daily rider. It will be ridden daily in all weather and occasionally locked up outside so longevity is key. I've read various reports that the outboard bearings are not as weather proof on UT. I appreciate they are easy to remove and re-grease but then again cartridge square taper are pretty much install and forget.
I'm reluctant to buy the proprietary cup tool, 10mm hex bit and bearing puller (or pay a shop to install) when I already have the tools for square taper, especially if the UT bearings need replacing regularly . I also don't own a torque wrench. So I'm leaning towards square taper.. Is there any reason /advantage to go UT? I can't see one but plenty of people use them?
Weight for each is approximately the same. I've had my bb shell faced and chased and it is within tolerance for UT.