Welcome to the SMF family
On the butt did you go by temp
195 to 205 degrees is recommended pulling temp.
The membrane on the ribs is a skin like "film " on the bone side of the ribs. If you get a sharp object (knife or poker) under the membrane & start to lift it from the back of the ribs it should pull off in a "sheet". It is easier to pull off if you grab it with a paper towel for grip.
There are dozens of different smokers the we use here on the SMF. Read around on the different threads & based on what you want in a smoker you can get a good idea of what you want. Then as questions about your top 3 or 4 to come to a final decision. If you do research here you should know a lot before you make your decision. If you know a lot about the smoker you sant then when you buy you should end up happy with it.