What's your preference?
I'm off to Mugello and the nurburgring in June and have been mulling over what to wear.
90% of the time it's leather for me, and that other 10% will be a textile jacket and only in very cold weather. (Off road is the only exception).
I mostly live in a made to measure BKS suit, and feel very safe in it.
Clearly they both have pros and cons. I reckon that whatever you're wearing, if you have an impact like a car bumper that's capable of breaking a limb, there's possibly not a lot of difference between leather or textile - hit some armco at 60 mph and it's probably all pretty immaterial. Aside from friction burns that's already been mentioned, is the other issue of bad ligament damage.
With a good quality made to measure (modern) leather suit, the suit is now cut to shape. In my suit, once it's zipped together I physically wouldn't be able to scratch between my shoulder blades - I struggle to pick something up off the floor in it! So if I come off and tumble, there's a good chance that my wind-milling body of flailing arms and legs will be better bound than in a textile suit - I'm less likely to come to rest with my legs behind my neck
Clearly, cancelling out all those advantages, is the practical every day life of touring, walking, going for lunch etc Do I want to be doing that walking like a monkey on holiday?
My choice for a holiday would be leather trousers zipped* to a textile jacket.
* any good seamstress or tailor will be able to do that for you - definitely worth doing ...
Have fun in Mugello and take earplugs! (and if you're a saddo that's into collecting knives, Scarperia is world famous for knife making - check out some of the shops and their pocket knives for hundreds of pounds ... !!)