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Basic materials vs better materials iirc.
I'm very happy with my Hubba NX, but haven't used an Elixir. Picked an Elixir up in a shop to feel for size and weight... it was quite a bit heavier than I expected. But you know that from the specs! A few reports of leaky MSR tents online but I've never heard of issues personally. For infrequent use, I'd probably go with the Elixir.
I looked at them and I think the Hubba is a smaller pack size ( Length) if that matters for your packing setup.
In the end I went for a Trekkertent ( Stealth 1.5) and custom poles.
I also use it for motorbike touring,so the extra space inside is handy.
I have Elixir 1 and 3 man tents. The 1 man is generously sized and much more roomy than most small tents. Hubba hubba is lighter but quite a lot more money.
I think the Hubba is a smaller pack size ( Length) if that matters for your packing setup.
Definitely consider this. My, otherwise lovely, Scarp 1 has a long minimum packed length so isn't really a good fit on my gravel bike.
The last tine I use a Hubba Hubba - admittedly in proper rough conditions - the height of the guying point at one end meant that end of the tent semi-collapsed inwards a number of times when end-on to the wind - 'in your face' annoying rather than catastrophic, but I think, if it had been my tent, I'd have looked at getting a new guy-rope attachment loop fitted in a slightly different position. Otherwise a really good mix of weight, bulk and useability and made from good quality components.
I've not used an Elixir, but I'd expect anything from MSR to be half-decent. I do own an Access 1 - a sort of beefed-up Hubba designed for full winter valley camping - and that's really good, albeit with a bit of a weight penalty.
ps: MSR does a Bikepack version of the Hubba Hubba with shorter pole lengths for easier on-bike packing btw.