Hmmm.. I have a slightly different take on Air Tight vs Atlas.
I also have XV-1s in my system and I have to say that while it is excellent, big, punchy bass, big huge sound, it does not quite have the refinement of PC-1 supreme or Lyra Atlas. XV-1t is going to be a comparable cartridge to these 2. I almost got the Anna Netrebko but put that planned on hold as I just ordered Minus K platform and am thinking of changing one of my tone arm first. Depending on where you are though, Anna could be significantly cheaper than Atlas and is probably closer to XV-1s/Titan but in the US certainly it would be closer to Atlas/1t.
In my system, I had both PC-1 Supreme and Atlas on Reed 3Q on my TW Acustic Raven AC-1 running into either Lamm LP2 or Aesthetix Io Eclipse. Lyra was running into Lyra Arion SUT when using Lamm. Air Tight was running into either Ortofon T100 or the new Dyna SUT into Lamm. I found Air Tight to be a bit leaner, sweeter, more delicate tone, a bit more extended on top, bass is not as big but as tight and deep. Lyra was actually a touch warmer in my system. It would be a hard call between the two but right now my Air Tight is on Graham which I never could get to sound the way I really for the type of music that I listen to most often but I prefer it on certain type of music over Lyra/Reed but I only listen to those type of music may be less than 10% of the time. So for now Lyra/Reed is what I prefer until I find a more suitable arm for Air Tight.