Gortex PRO has 3 layer, and the membrane is bonded between the outer fabric and the liner on the inside.
2 layer bonded Gortex also keeps the membrane bonded to the outer layer, but the membrane is protected from the inside by a lose liner.
See this link:
https://www.gore-tex.com/outerwear/gore-tex-products
The laminated Gortex allows for only the outer layer to get wet. The advantage compared to gortex with a waterproof liner is that the jacket is dry again only a few minutes after the rain stops, wheras the garment with a liner takes a good while to dry up. This also means that you feel less cold when garment is wet, and the jacket does not get much hevier when wet.
The advantage of seperate waterproof liner is that when you remove the liner, the breathing is much better. Even if Gortex is amongst the best when it comes to breathing, it still get moist in hot weather (above 25C).
There are lots of opinions of what to choose.
It boils Down to this: You get what you pay for.
Living in Norway we get exposed to all kinds of crap. The Gortex will not protect me from the crap from my Government, but as for a rainy day it works.
My personal opinion, and what I buy:
I only look for two brands: Rukka and Klim, and Gortex PRO only.
Rukka is the one I use spring and fall. Zip it up and it's as waterproof as a frogs ass. But its warm, and the with limited vents, so when the spring kiks in I use the Klim suit (Badlands).
The Garment of the Klim is waterproof a well, EXCEPT the solution around the neck. That is a crap solution. However. I have solved the leaky neck issue by using a Scott Neoprene collar.
In very light rain the Stock Klim collar will do, but in heavy rain I put on the Neoprene collar and tighten up the Klim collar, and at the end of the day, my T-shirt is dry enough that I don't have to change when going to the bar. (except it smells, so I change anyway).
Klim does not come with an extra warm inner liner, as Rukka does. But thats ok. Further, the venting of the Klim is supperior to the Rukka.
Both are quality products, and priced accordingly.