If two scopes made by the same company have a 3X magnification range and another goes 5X are there any compromises or negatives you get when you go from a 3 x 9 to say a 2 x 10 ?

Also if a scope has a constant eye relief from say 2x all the way up to 10X vs scopes that eye relief gets shorter as you dial up the magnification is it a superior design or does it also come with a compromise or negative?