car seat recs?

Hi, I just passed my driving test. although I don't think it's a good idea for me to have my kids in the car with me until I'm a bit more confident, I want to get some car seats for when I feel like I can. I've tried having a search around but.im just overwhelmed by the amount of options. If anyone has any recommendations that would be amazing! Some important notes:

- I have quite a small car (Dacia sandero 2017)

- I have almost 3 year old twins

- I'd like prefer for them to be faced backwards for as long as possible with 360° spin and isofix installation

- the budget is probably around the £200 each mark

- this one is more of a preference and not a priority but I'd like ones that are colourful or have a fun design. I thought the cosatto ones were cute but I've heard they're not the safest option

Thanks in advance!