I had the same questions trying to decide between the takibi octa or the hexa evo + fire-resistant liner combo. I emailed snow peak recently and the guy replying was really helpful. Here's what he said:
" Personally, I agree that the two-pole configuration is slightly easier to set up than one involving four poles. I will note that setting up the Takibi Tarp Octa with four poles follows a similar process as your Takibi Hexa Set M, because you will essentially erect the two tall poles first, with the wing poles being next in your order of operations. The Takibi Tarp Octa does also require more points to stake down as well. So altogether, the Takibi Tarp Octa is slightly more set up.
The next point is the surface area of the tarp, and the surface area of the fire-resistant inner roof. The Hexa Evo Pro dimensions will note that it is significantly longer (listed at 21') versus the Takibi Octa Tarp (listed at 16.7'). However, the Hexa Evo Pro inner roof does not offer complete coverage of the outer tarp. This will reduce the effective gathering area when paired with the inner roof, and anecdotal reviews from our Snow Peak Japan customers have expressed concerns about use in high wind conditions blowing sparks into the body of the outer tarp that is not covered. Furthermore, the Takibi Tarp Octa is listed as a gathering space for 6-8 people, while the Hexa Evo Pro is most commonly rated as a 4-6 person tarp. So the Takibi Tarp Octa may in fact offer more fire-resistant gathering space for your party, and be a more comfortable option.
I have more personal experience with the Takibi Tarp Octa, as we have used this for Snow Peak company outings and field demonstrations. We were able to fit two Campfield Futons, two Pack & Carry XL fireplaces, and a generous amount of Low Beach Chairs/Take! Chairs around our space to accommodate our team. My own personal opinion is that the additional time taken to set it up is worth the comfortable space provided.
I believe your decision will depend on the size of your party, your preference on the look of the tarp, and your willingness to purchase extra components necessary to complete your set up. "