In terms of "warm2 and "soft" there are indeed many choices. Best seems to be a real analog synth.
The warmest synth i ever experienced was maybe a real Jupiter 8.
The Jupiter modules in Diva and also Arturia jupiter 8V are quite good to recreate that sound while they are maybe not perfect.
One of my favorite softsynths is Saurus and it could quite easily do some really "warm" and soft sounds too.
Also the free OBXD synth could do some extremely warm and soft sounds, especially pads.
Speaking about "digital warmth" i mostly get a "warm2 and "cosy" feeling with some of the pads from my Wavestation EX (comparable with the plugin but not exactly the same for me...).
Of course like also some wavtetable synths it could also sound "glassy" and "typical" digital.
Finally the impression of a "warm" or "soft" sound also depends mostly on the sounds you create. Even a real analog synth could sound very harsh and/or "metallic" if you are able to program it that way (e.g. by cranking up Cutoff and/or Resonance or using FM and/or a Ring Mod). In a multimode filter it could also dpend on which filter mode (e.g. LPF, BPF, HPF, Notch) you use.
With a Comb filter like in e.g. Largo it seems to be more difficult to get a "warm" or "soft" result but i do not think it is it's intended use in that case. In fact in the Comb filter the Cutoff is more for getting different timbres, much more than with e.g. a LPF.