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I previously owned the standard ti-tri (sidewinder and ULC were not available for my pot) and recently acquired the bushbuddy ultra. After using it for about a week, I happily sold the ti-tri without regret. I was using them primarily in wood burning mode with esbit as backup.
My comparison went something like this:
Simplicity/ease of use: Bushbuddy Just invert the pot stand, insert handful of twigs, and light up. In contrast, the ti-tri with inferno and floor had 9 pieces (ti-tri, inferno, floor, grate, grate holder, 2 stakes, gram cracker, caddy). On cold winter mornings, anything I could do to speed morning departure and avoid cold hands was key. I preferred the easy stowing of the bushbuddy to the more time consuming disassembling of the ti-tri. I also had to be much more vigilant about not losing the stakes or grate holder which seemed apt to disappear into leaves or snow somewhat readily.
Storage: Bushbuddy Fit easily in my pot, taking up no extra space. Backup esbit and firestarter could be stored inside the body of the bushbuddy. In contrast, the standard ti-tri needed a separate caddy (I used a plastic cup for weight savings) which took up more space. Tightly rolling all the parts to fit in the caddy was more effort as well.
Weight: Comparable, edge to Bushbuddy Bushbuddy weighed 4.9 oz. Caldera (with inferno, floor, grate, 2 stakes, gram cracker, plastic cup) weighed about 5.8 oz. Some weight could have been saved by omitting the inferno if desired.
Wood burning efficiency: Bushbuddy Able to achieve a 3.5 cup boil with a handful of twigs. Did require stoking once during process but this never bothered me. Ti-tri inferno could be packed with more wood to decrease need for fire maintenance, but required more fuel overall to achieve a boil.
Versatility: Ti-Tri. If you are looking for an alcohol/esbit burner that can also burn wood, the ti-tri is the clear winner. Where I live, wood is plentiful and I found one backup (esbit) to be sufficient. I was able to achieve a 3 cup boil in the bushbuddy with a single esbit. I didn't find the ti-tri to be significatly more efficient to ofset the other disadvantages above.
Workmanship/Durability: Comparable. Bushbuddy was a work of art, but required more care in handling to avoid denting. A titanium bushbuddy would be a significant improvement.
In summary: I think both are outstanding stoves.
Owning a sidewinder or ULC may offset some of limitations of the ti-tri (mostly packability). Those interested in a multifuel stove will prefer the ti-tri
For me, the bushbuddy was the hands down winner for reasons of packability, wood burning efficiency, and simplicity of design. I just wanted to offer this alternate opinion for those looking primarily for a woodburning stove.
 ti-tri in woodburning mode
 Bushbuddy in esbit mode
 A thing of beauty
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