I have been to a Stewarts class, looked many planes over, and really studied what and why.
You really are asking the same type of question as if you came on here asking about religion, or headset brands. Everyone has their reasons they like what they have, and the other systems are junk.
My Maule will get Oratex this winter. Once finished, it is the lightest of the fabric systems. It takes the least amount of chemical application. It can be a glue on, shrink and done system. No paint needed. Purchase cost is higher, but the savings in spray equipment helps with that- also the amount of time to do multiple coats and sanding. Repairs are glue a patch and iron. Because I am limited in room and heat controlled space, many spray coats does not appeal to me.
The down side is that it does not offer the 'classic' look exactly like other systems. Color choice is limited. It is a plastic type material, which requires either waxing once a year, or it can get a 'dirty' look along the seams I am told. So I figure the exterior will take 8 hours a year of clean and wax care.
Which ever one you choose, if this is your first, I will suggest you find a person experience with that system, to come help you for the finish work. There are so many tricks people learn after doing three or four planes that they don't even think to tell you- just do. It will save you as much in ruined materials and time to have them work for you two weeks when it comes time.
Oh, I have been told that when spraying dope you want to be facing DOWNWIND!:lol: