Evening all

I’m from just over the pond in the UK. I am now seriously hunting for a used RZR. My wife and I both have Grizzly 700 quads, she wants off hers and into a RZR.
I know I don’t want a 1000. But I’m torn between an 800 and 900. I’ve been offered a 900 for £10,500 ($16,000) and an 800 for £8400 ($13,000).
Yes I know we get screwed on prices. Both of those are used as well.

What are the differences between the 800 + 900? Is the 800 worth the money? Am I better off saving for the 900?
Are there any weaknesses with either model?

We only want it for gentle trails. Nothing hardcore and to be fair we’ll have the 2 dogs in the back anyway.

Your thoughts and ideas are welcome