Car Seat Advice UK

My step daughter is insistent on getting a pink car seat and the two ones I'm trying to pick between are Puggle Maxi Gro Comfort Group 1/2/3 Eco Car Seat Booster Seat - Blush Pink Vs Graco Junior Maxi™ i-Size R129 High Back Booster Car Seat - Pink. Any advice on which is better in terms of safety? Got a lot of mixed reviews

Has anyone got any tips, tricks, suggestions on how to stop a toddler (23 months) from taking their arms out of their car seat straps? We’ve got an Axkid minikid 4 pro, the straps are pulled as tightly as I can physically get them to go but she is still managing to take her arms out and then as she only has the strap across her upper thighs she’s able to sit forwards, twist and try to completely climb out. Luckily on the 2 occasions it’s happened this weekend we’ve been able to pull over very quickly to put her back but I’m now so anxious about going anywhere on my own in the car!

Any advice for this please or has anyone experienced? We have it tilted as much as it can be tilted and straps are tight. When 18 month old is asleep her head is touching her chest and moving side to side, she keeps waking and touching her neck as obviously hurting. We have a Tesla new model Y so not exactly a small car.

We’ve currently got our 3 year old rear facing in the Joie I- spin 360 however I believe she’s hit the height limit of 105cm so we’ll need to get her a new seat. I was adamant I wanted to keep her rear facing for as long as possible but we just don’t have the budget for something like an Axkid. I’m open to forward facing I just want her to be in the safest car seat we can! Any advice and recommendations would be really helpful thank you so much!

Does anyone know how to adjust the straps on this car seat? It’s got a leaver and we can’t figure out or find instructions