I would agree with AirWillie
Very last seat on the RHS, then you get a good view of the landscape below, the wing and flaps, the extractable landing light, and engine reverse thrust!
I have flown many times on Easyjet and BMIBaby 737s and on Ryanair's 737-200s and always try to get that seat. I don't know, however, why I prefer the right hand side.
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