cyclonite
has a lot more experience of crashing than me, so best listen to the young 'un if you want to know about protection...
Good quality breathable, e.g. Goretex, textiles are best if your going to be far from home and it might well rain (or even snow, in April!) - i.e. UK friendly - but after buying them your wallet mightn't be as fat as folded up waterproofs.
Leathers tend to be better ventilated, cooler, comfier and more protective, mandatory for track days, but not even remotely waterproof (except Proshell). I ride all year and my leathers get a lot less use than my textiles, but there are a few days, sometimes weeks, each year when even leathers are barely tolerable heat wise, even up North.
A lot of riders mix it up, e.g. textile jacket, leather trousers.
In the peak of summer only short sleeved shirts are cool enough for Parisian Gendarmes...