How much difference is there is quality of line and will the better stuff improve things?

I've noticed some anglers line to be really supple with no memory, I'm sure I'm missing out and often get loose tangles in mine when I'm casting and definitely some memory. I'm currently using a Greys GRXi floater, is it worth upgrading?

supple gives you special powers.

I think the Grey's Platinum line is a much nicer line and much more supple. I like it a lot. Just got a line from the Pitsford Pirate and like it very much as well. Seems very similar to the Platinum but less than half the price. Definitely worth a try.