I don’t know about the new ones, but I used to find Oranges measure short.
A 17 inch Orange p7 is about a 16 Kona, Specialised, and 15.5 Marin (well,they were when I was trying out bikes years ago).
I am 5’6ish with a roughly 30 inch inside leg. I’d not want bigger than 17, but it gives me plenty of stand over height. As an odd shape I also ride a 50cm Bianchi racer, where as convention would put me on a 52 or 54 cm ride.
I think p7’s are reasonably long in the top tube, compared to others, so thats something to bear in mind.
Best thing is to try a couple in all honesty.