So what I'm taking from these last few comments is that the geometry of the frame is going to give me a more comfortable ride ..must remember this when deciding which bike to buy .
No, I think you've been mislead by fancy words. Geometry.
It means nothing.
All bikes for a given purpose - road, utility, MTB, Downhill, etc, have frames with angles within a degree, perhaps two, of each other. Further, the only angle that does matter to the steering (note, not to comfort) is the head tube angle. However, even that has to be coupled with the fork offset before you can make a judgement.
Now, if you were to decide on a (fictitious) optimum angle with the corresponding "right" fork offset, I wish you good luck in finding your dream bike.
Further, "comfort" is simply compliance, which in turn is a fancy word for springiness. Frames, thanks to their diamond truss design, are essentially springless. They have to vertical "give" of note. By that, I mean that their flex is less than the rubber in the tyre, nevermind the air in the tyre. The only place where there is some vertical "spring" in a bike is in the steerer tube (fork). Again, that is minimal and we know this because of the longevity of headset bearings. If there was more spring in the fork, the bearing will be pulled out of alignment and fail very quickly.
Therefore, there is effectively no "comfort" in either carbon, titanium, steel or aluminium bikes. None. Ziltch, Nada.
Comfort can of course be found in ride position and that's a matter of getting the approximate right size bike and correct stem and seat height. I say approximate frame size only because the new BS "science" of bike fitting has pulled the arse out of the chicken with this one. There is no need for millimeter precision in a fit - Small, Medium and Large is good enough for average body shapes and configurations. The fine tuning comes with saddle and handlebar position.
In summary:
Forget about the material. One won't give you more comfort than another.
Don't overthink this.
Choose a nice colour.
Fall in love with the bike and ride it.