Hi @YellowPink2026
Affix is not the same model as i-Trillo. I don't think Affix has a Joie equivalent or an ADAC test result, so I am not sure how it performs. I have a feeling that the Graco Assure and Affix were a pair of Graco US models which were brought over to the R44 standard, with Assure being non-isofix and Affix being isofix versions of the same model, and this being a premium model in terms of comfort, rather than having extra safety features. However, I'm only about 80% sure of that. It's more of an educated guess.
Eversure and i-Trillo are technically identical models, although I lose track of which versions have isofix or the softlatch connectors. It was tested under ADAC in 2022 which is just one step behind the current test standard, so it's still a comparable result, and was one of the best performing high back boosters at the time. It's £40 with free delivery on the Graco website.
We have the i-Trillo FX or LX (I forget, but rigid isofix), and one issue I have with it is that we mainly use car sharing, and it is too wide in a lot of cars for the seatbelt to fasten comfortably. We often have to undo the isofix or sometimes use the buckle from the middle seatbelt instead. So I would say that the best thing to do is to check the seat actually fits well in your car before purchasing.
The Joie i-Trillo is £50 currently at Argos. I also really like the i-Traver which is £100. The extendable leg rest is a really good feature. If we were not moving to car sharing, I would have got the i-Traver rather than the Trillo because I think it's more comfortable. However my DS is very keen on the cup holders in the Trillo!
I would be interested to see if any of the Graco seats which reuse the old model names (Logico L R129 / Junior Maxi R129) are included in the next ADAC tests which are due at the end of this month. The shape of the booster part is similar to the R44 versions of these seats, which never did very well on ADAC and were very dated in design, but the actual booster part of them was always good for lap belt position. The shape of the headrest and high back is much more like the newer Joie seats, and they don't come apart into backless boosters, so it's possible they might perform better than the older models.