You seem to be all over the place. If you get nylon inside and smooth rubber outside the suit will be strong, reasonably warm in the water and very warm on the boat because it will dry quickly. The smooth rubber exterior will be susceptible to UV damage and abrasion and may last 100 days of diving would be my guess.
If you get a smooth rubber exterior suit, definitely buy some wetsuit glue as well, it is easy and necessary to fix little cuts and abrasions before they expand.
If you get a suit with NO, nylon either inside or outside (if they make that), the suit will be warmer, more easy to tear (because the nylon does strengthen it) and be super comfortable and flexible.
Also, you need to realize that if you get a suit without a nylon internal liner, then you will need to use soap, bably shampoo or hair conditioner each time you put the suit on to provide lubrication.
If you are getting a 6 mm suit and the water is above 55 degress, and you want a smooth ruber outside, i would get the nylon on the inside. Also, for scuba, a medium density rubber like heiwa (spelling?) has held up very well to multiple compressions when scuba diving for me).