"do or do not, there is no tri" (yoda)
I really like the Ti Tri stoves; I have two of them in fact. One for a big pot when cooking for 2-3 people, and one for a solo pot. But where they really shine is in alcohol and Esbit fuel use. Not so good as a woodburner IMO, and ill tell you why in a minute. First the good: good that you can use wood fuel as a backup, and I have needed to do that and appreciated the flexibility (you do not BTW need the Inferno insert to do this, but I have used the two-piece ti floor you can get from TD instead as a ground shield). But the bad: you end up with your cone, a large surface area, covered with soot, and because you roll it up to store it, I have found it difficult not to get soot on stuff - hands, caddy, fuel bottle stored in the caddy, etc. I'm sure there are ways to minimize this, but I find it annoying enough that I would never PLAN to use a Ti Tri as a wood burner, just as a backup plan if I run out of my primary fuel. However, if I am planning to use alcohol or Esbit as my primary fuel, the Ti Tri is what I put in my pack. I would typically do this if I expect foul weather or I'm above tree line or a fire ban exists, etc.
The FireFly is a more desirable wood burner than the Ti Tri IMO. More concentrated burn, more complete burn, FlexPort side feed option, much less soot more easily avoided. It's not as good as an Esbit or alcohol stove as the Ti Tri. So I use it when I'm expecting to burn wood as my primary fuel, and I would personally use Esbit as a backup if I thought I might need another fuel option.
So in my gear closet, these are actually the only types of stoves I use. If I went above tree line in winter and needed to melt snow, I do have a white gas stove that I would pull out of mothballs (MSR Simmerlite).
Your opinions may vary. I'm sure this discussion could go on a long time. ; )