One thing I like to do is look at the various flight options when I am actually booking the tickets.
In my experience that is the best time to decide which flights are the most desirable ones for me to take.
That way, I won't show up at the airport and realize that I didn't buy what I really wanted to buy, expect the airline to correct my error in a way that ignores the contract I purchased from them, and then embarrass myself on the internet when I complain about it.