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Bud is right, except that adjustable objectives typically have a finer adjustment than side parallax/side focus adjustment. I've owned both,and have never had a problem with adjusting either.
Also, side focus/side parallax adjustments allows a smaller objective bell diameter for the same size lens,allowing you to mount the scope slightly lower, and they allow use of flip up Butler Creek type scope caps, which a rotating AO makes difficult to use..
Typically the brightness difference between the two types isn't a practical issue,because most scope makers sell either AOs or side focus in a given line, rather than both types,preventing a direct comparison. Get the scope that looks brightest to you.
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