Cybex solution seats

[Smurf123]

Can anyone tell me the difference in the cybex solution seats?

I'm looking at the cybex solution m fix sl
Cybex solution s2 I-fix
Cybex solution x fit

Other than price what's the difference?? They all have isofix, all have the recline and all have the reclining headrest?

Ds is almost 4 but just below the 18kg threshold of his joie 360 spin

Thanks

The S is a higher grade one than the X. The side impact protection is fuller and deeper being the main difference.

Thanks Bertie
Also looking at the m fix sl all 3 get good reviews and scores from what I can see.

Tried to look at the britax kidfix but no where near me has it unfortunately to be able to see it.