Speaking as someone who has had both a partial and a total, I can tell you that there is absolutely no difference in range of movement between them.New consultant said he felt a partial was more beneficial at my age rather than a total, as a partial gives a better range of movement as is better for someone of my age that is more active, also the two outer compartments are not showing any signs of damage at present and why replace something that is ok.
Nor is there any need to differentiate based on your age between having a partial and a total. The only consideration should be the state of your knee.
I had a PKR that lasted 11 years and then a revision to a TKR on my right knee. When my left knee developed osteoarthritis, I chose to go straight to a TKR, even though only one compartment of my knee was involved at that stage. I chose that, so that I would have just one surgery, instead of two.