I see two choices; garden-variety nylon/polyester fabric gear, and . . . Gore-Tex.
With conventional outerwear, you are at the mercy of a waterproof liner or over-garment. Sheds water, but . . . doesn't necessarily expel moisture from the rider's body; can get rather soggy in there, especially in hot weather.
Integrated Gore-Tex fabric? Sheds water rather well, ventilates somewhat simultaneously, so they say. BTW; you'll pay handsomely for this freedom from waterproof liners.
Not much novel information or profound insight posted so far; I'd say . . . the choice depends largely upon the rider's planned itineraries (and his budget). Is semi-local, discretionary recreational riding planned, or . . . a traverse of Panama's Darien Gap, unsupported? Is the budget in the hundreds of dollars, or topping a thousand?
Generally speaking, plenty of serviceable gear is available, across a wide price-range spectrum. Choice depends upon the rider's preferences and application, as well as his budget. I've crash-tested and environmentally-tested riding gear from several manufacturers; haven't been disappointed in any of them; remain thankful for ATGATT (All The Gear All The Time) saving me from serious injury, and for reasonably climate-sensitive gear saving me from weather discomfort.