I used a lot the samplemodeling one (with trumpet too) in a studio where I used to work and I have to say that is the most real to my ears even if you don’t use all the control possibilities. The legato sounds almost perfect out of a box and with just a bit of expression control the results are quite convincing. A real sax player can probably find the attack lacking of power and I have to agree but we know that right now for every acoustic instruments played well we can’t find a sampled counterpart that keeps the comparison…
BUT, listening to demos only (thus use grain of salt on this) it seems to me that the new swam engine makes the sound a little more artificial than the previous kontact version (the one used by me).
Also all samplemodeling are good for solo use but not so good for big ensenbles imho.
Of the following I own only NI Session Horns (not good for sax solo parts) thus my judgement is based on mere research work. A very recent research because I was searchin for a sax to use in a Christmas song for AJ I then used a piano instead…
The embertone one seems limited in the fact that the ‘sex’ part is programmed and you don’t have control on slurs and the like but the intensity of the effect only; said that both the legato and the sound are very good. If you need a sax like the one listened in their demo just get it; and the price is reeally cheap.
I personally don’t like the linplug one, too synthetic.
For general use (not sax in particular) I’d also consider NI Session Horns and Chris Hein Compact library; the latter has maybe the best bang for the buck ratio
Than, if you have the moneys, here is the one I prefer: http://www.fablesounds.com
I find it very convincing especially for ensembles.