For landscape would you want something that has a wider frame? With a 50 you could get what 35 would see but you would have to back up a lot to get that much in frame. Then you also have to take into consider since you have the kit lens that reaches 50mm do you want to spend the money to get the f/1.8 but same argument could be made about the 35 also. Do you see yourself using the 50 or 35 in low light situations? And if so then next think about how often you would you would use the lens outside of dark rides and whether you want the extra length the 50 would give you. You could always rent each lens and test them both out and see how each does. What works for me may not work for others or vice versa.
