Short guide to CHF fixed income options should have all the pointers (incl. to more detailed articles for the various options).
FWIW you probably won’t get anything interesting from UBS, it’s going to be expensive and fairly low returns.
VT is US, probably best for you (esp. since you likely don’t even care about US estate anyway given your wife is a US citizen, and might be above the 60k threshold if you also have RSUs from a US company).
Note: this is super long duration, lots of interest rate risk make sure that’s what you want.
Got it, I wonder how it works in practice. Since you’ll be filing jointly for swiss taxes, I guess there’s some kind of complicated process to figure out which part of the joint swiss taxes can be claimed as credit to your spouse non-joint US taxes? (given it’s IRS I assume those stuff are non trivial and you have someone taking care of it for you).