Would definitely reccomend DT swiss.
I’ve got XM481s on my trail bike and just built up some of the aforementioned XR361 on my Sonder Gravel bike.
I would say the slightly wider XR391 is the one to go for in the range for a Singular Swift, presuming your running XC MTB tyres in the 2 to 2.2ish range.
The DT rim range are expensive, but the higher end rims (all those mentioned above, basically the ones with red/black graphics) are very nicely made, they have a really nice durable matt/bead blasted style finish, and they are really nice and easy to build using the DT ‘squorx’ nipples which come included in the box (clawing back a little of the cost too).